Where to design 3d prints

What software to use for 3D printing: The complete guide

David Roberson13 May 2021

Guide

Before starting to 3D print, you will need to make sure you have gathered all the necessary software “ingredients” that will guide you through the printing process, from preparing your 3D model to managing printers themselves.

These include:

CAD software to create a 3D model (you can also use an existing 3D model, if you do not wish or need to design one)
Slicing software
Software to operate your printer remotely (this is optional, but can be convenient)

This article will go through each of these ingredients, and will also touch on how the Ultimaker platform creates a seamless end-to-end flow between hardware, software, and materials, empowering you to unlock the magic of 3D printing and make innovation happen.

What is a “slicer”?

A 3D printing slicer – also known as slicing or print preparation software – is a program that converts a 3D model into a language your 3D printer understands.

Slicing software, such as Ultimaker Cura, digitally cuts a model into flat layers, which your printer can then print one by one. With the Ultimaker platform, however, slicing software is not always needed, thanks to integrations that allow you to print directly from CAD or the Ultimaker Digital Library.

Preparing a 3D print using Ultimaker Cura software

What is the best CAD software to design 3D prints?

CAD, or computer-aided design, software enables you to design a 3D model from the ground, up. There are many types of CAD software, each with its own benefits. AutoCAD, created by Autodesk, is perhaps the best-known among them since it was one of the first CAD software programs available for personal computers when released in 1982. Other CAD platforms include:

Fusion360 – great for designing and creating efficient mechanical parts
3ds Max – used in all types of 3D model creation, including video game design, architecture, and 3D printing
TinkerCAD – A free, browser-based CAD tool that allows users to build 3D models out of various shapes. Popular with CAD novices and for STEAM education
Blender – free, open-source 3D model creation software
Siemens NX – for designing and creating advanced 3D models
Solidworks – for designing and creating professional parts for industrial use
Catia – Advanced design software used for creating surfaces and engineering systems

Before you begin 3D printing, be sure to do your research and pick the CAD software that’s right for your use case. This way, you’ll get the most out of the model you choose to design and print.

Also check which file types your slicing software is compatible with, so you can make your 3D designs into 3D prints.

A design in CAD software (left screen), slicing software (right), and the finished print

How to design parts for 3D printing?

When designing for 3D printing, there are best practices to help you get the best results from your 3D printer and the parts it creates. Design parts optimized for 3D printing will improve print success rates, reduce costs through lower wastage, and boost the speed of your product development cycle.

Consider build volume. Your 3D prints can only be as large as your printer’s build volume. Be sure to know its dimensions, then create a part that can either be printed within those dimensions in one go, or plan to use modularity (printing then combining separate parts).

Decide orientation early. Because FFF prints layer by layer, determining the print orientation early in the process helps drive design choices, text alignment, and snap features.

Evaluate overhang support requirements. FFF printed parts are self-supporting up to 45 degrees. Overhangs below 45 degrees must be supported from below with support material.

Follow bridging support guidelines. For most basic filaments, FFF printing does not need support when bridging materials within a 10 mm gap.

Pay attention to nozzle size. When designing small features, you should consider height, wall thickness, and nozzle size. Larger nozzles will print faster than smaller nozzles, but at a cost of increased minimum thickness and height for your models.

Design with hole diameters in mind. Generally, 3D printed hole features should not be smaller than 2 mm. If accurate holes are required, it is recommended to design the holes smaller than intended and post-process with a drilling operation. 

Avoid sharp corners. Sharp corners can be modelled in CAD, but the print may warp. Increasing the area of the surface in contact with the bed will decrease the likelihood of the warpage.

For a deep dive into these factors and more, check out our blog on design for 3D printing.

What software do I need to start a 3D print?

This depends on how much of the 3D printing workflow you need to perform.

As long as you already have access to a 3D model, you will typically need software that can slice that model, so your printer can get to work. Once you have started to print, you can also use software to manager your 3D printer (or printers) remotely.

But as we saw earlier, the slicing step can be avoided if you have a 3D printer integration installed in your CAD tool. If you already have access to a 3D printable file (such as a G-code on a USB stick) you can also go ahead and print without the need for any slicing software, as your digital file is already ready to print.

Controlling 3D printers remotely with Ultimaker Digital Factory software

Managing 3D printers remotely

Ultimaker S-line printers, the Ultimaker 2+ Connect, and the Ultimaker 3 can make use of a network connection to access cloud-based services on Ultimaker Digital Factory. By linking a printer to your Ultimaker account, your printer can then be controlled remotely, from outside of its local area network.

Want to learn more about 3D printing software?

Download our free white paper, “Important 3D printing software features,” which will help you determine the best 3D printing software for your business needs, as well as examine settings, print profiles, and other features that can help you get the most out of your printing experience.

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Software for 3D Printing - 3D Modeling Software/Slicers/3D Printer Hosts

An Overview Of The Best 3D Printing Software Tools

Every 3D print begins as a 3D model generated in a modeling program. Years ago, we had to spend lots of money and time to acquire and learn modeling software. Now, there are many easy-to-use modeling software options available, many of which are free. This list includes some of the best options and is sorted by price, with the free ones sorted alphabetically.

The list also indicates whether the software uses solid modeling, a type of 3D modeling that always generates models that are “manifold” or “water tight.” A manifold model is one in which all walls of the model have some thickness, which is necessary for 3D printing. By contrast, software that uses polygon modeling can generate walls that have zero thickness; that’s fine for creating computer graphics for games and movies but not useful when 3D printing the models. Manifold models can be created with polygon modeling software, it just takes more steps and experience. All the software in this list can create 3D printable models, but every model that comes out of solid modeling software is 3D printable.

Additionally, we’ve noted what skill-level of user each software is designed for: beginners, amateurs, advanced users, and professionals. In general, the easiest to use options are near the top and the most powerful options tend to be near the bottom, though there are some outliers found throughout. Most of these software can be tried for free and there are free tutorial videos available for all of them.

Quick jump to:

3D Modeling Software

Shapr3D
Tinkercad
Blender
BRL-CAD
DesignSpark Mechanical
FreeCAD
OpenSCAD
Wings3D
3D Slash
SketchUP
Fusion 360
MoI 3D
Rhino3D
Modo
Cinema 4D
SolidWorks
Maya
3DS Max
Inventor

Slicers & 3D Printer Hosts

Ultimaker Cura
Simplify3D
Slic3r
Repetier
KISSlicer
ideaMaker
OctoPrint
3DPrinterOS

3D Modeling Software

These tools are all about creating models for 3D printing. Some of them are pretty easy to use while other programs are only suitable for professional users with years of experience.

Shapr3D CAD Modeling

Price: Free, $239/year for professional
Solid modeling: Yes
Intended for: Beginners and Professional
What makes it special: An intuitive multi-device CAD experience allows you to design anywhere with ease.

Shapr3D is superb for professionals and hobbyists alike. It has an extremely intuitive and innovative user interface which will allow you to create models faster with the same high level of precision.

With their Visualization feature you’ll also be able to preview models in AR to ensure that your print will be perfect in its intended location.

Shapr3D is available on iPad, Windows, and Mac – and it will keep your files synced between them! I would 100% recommend checking them out.

Tinkercad

Price: Free
Solid modeling: Yes
Intended for: Beginners
What makes it special: It’s designed to allow anyone to create 3D printable models and serves as an introduction to solid modeling.

This is a browser-based 3D design app geared towards beginners. The software features an intuitive block-building concept, allowing you to develop models from a set of basic shapes. Tinkercad is full of tutorials and guides to aid any aspiring novices get the designs they’re looking for. It even allows you to share and export files with ease.

With a library of literally millions of files, users can find shapes that suit them best and manipulate them as they wish. It also has a direct integration with 3rd party printing services, allowing you to print and have your print at your door-step at the press of a button. Even though it can be a bit too simple to the point of limitation, it serves as a great way to learn about 3D modeling.

Blender

Price: Free
Solid modeling: No
Intended for: Amateurs and advanced users
What makes it special: It’s open source, feature-rich, and includes tools for sculpting, animation, simulation, rendering, motion tracking, and video editing.

In essence, Blender covers many facets of 3D creation, including modeling, animation, and simulation amongst others. This open-source software has a steep learning curve and is ideal for users who feel ready to transition to designing complex 3D models. Check out our Blender tutorials for 3D Printing page.

Blender is actually a free 3D modeling software which was originally for 3D animation and rendering using polygonal modeling techniques. Despite its origins as a software for artists, it is considered quite accessible. One of the software’s interesting features is the photorealistic rendering option. This gives the models an air of realism that few free software can achieve.

BRL-CAD

Price: Free
Solid modeling: Yes
Intended for: Advanced users
What makes it special: Developed and used by the US Army to support ballistic and electromagnetic analyses. Also includes ray tracing and geometric analysis tools.

This open-source software is an advanced solid modeling system with interactive geometry editing. It is apparently used by the U.S. military to model weapons systems, showing that it is quite dependable but also very advanced. BRL-CAD offers a high level of precision due to its use of specific coordinates to arrange geometric shapes.

It offers a large library of simple and complex shapes users can implement into their own designs. They can take multiple shapes and combine them at their leisure, as well. The software used to be quite costly, however it was converted to open source a few years ago. It includes over 400 tools in its arsenal. It also runs at great speeds, especially considering how dense its features are.

DesignSpark Mechanical

Price: Free
Solid modeling: Yes
Intended for: Amateurs and advanced users
What makes it special: A library of 3D models from industrial suppliers and the ability to generate a bill-of-materials for designs. Electrical and PCB CAD tools are also available.

This nifty and free CAD software is ideal for professionals and advanced hobbyists alike. The user interface is relatively straightforward and the software runs quickly, meaning efficient designing. You also have the capability to generate a bill-of-materials that calculates the cost of printing potential 3D design projects.

DesignSpark Mechanical allows users to utilise an in-built library to mix with own drawings. Another feature that new users might find useful is the pull feature that allows users to create 3D models from only a surface. It is feature-rich for a free software and quite beginner-friendly.

FreeCAD

Price: Free
Solid modeling: Yes
Intended for: Amateurs and advanced users
What makes it special: Models are fully parametric and recalculated on demand with an undo/redo stack. Other features include robotic simulation, architectural tools, and a path module for CAM (Computer Aided Manufacturing).

A parametric 3D modeling tool that is open-source and enables you to design real-life objects of any size. The parametric component makes editing your design a piece of cake. Simply go to your model history and change the parameters, and you’ll have a different model. As the name suggest, it is in fact totally free. The upside of this is that none of the tools are blocked behind a pay wall, so you can tweak your models to your heart’s desire.

It’s not the best for professional purposes, but it’s a great training tool. Despite it’s basic options and design elements it’s worth a try if you’re new and don’t want to have to invest in something before you dip your toe in the water.

OpenSCAD

Price: Free
Solid modeling: Yes
Intended for: Amateurs and advanced users
What makes it special: Designed for programmers, models are generated through typing scripts.

OpenSCAD is a free software with a ton of features and a unique way of creating models. This software takes a programming approach to 3D modeling, making it a unique addition to this list of 3d printing software tools. Instead of the traditional interactive modeling interface, users write code in a script file that describes the parameters of the 3D object. Once you’ve entered your code, you can view the shapes you’ve created by clicking a “compile” button.

Another great feature that OpenSCAD has is the ability to import 2D drawings and extrude them as 3-dimensional. It uses a part profile from drawings made in a standard sketching software and use the SXF file to do this. With its stronger focus on programming, OpenSCAD may appeal to some while alienating others. Regardless, it is still a powerful tool.

Wings3D

Price: Free
Solid modeling: No
Intended for: Amateurs and advanced users
What makes it special: Polygon modeling enables the creation of more organic shapes. Standard tools can be accessed through a right-click menu.

Wings3D is another open-source polygon model tool. Despite being freeware, it comes with a wide range of mesh and selection tools. Tools like mirror make symmetrical modeling a breeze. Seeing as it is a program for beginners, it is very user-friendly and the learning curve is quite steady. Features like the customisable hotkeys and easy to use interface are indicative of its status as an ideal tool for starters.

Despite the ease of use, it has no shortage of useful features such as plane cut, intersect, inset, bend, sweep, circularize, and sheer, making it capable of some very impressive models. It also supports a very wide range of file formats for both import and export. Despite its simple and plain looks, it is definitely worth checking out if you’re just starting out.

3D Slash

Price: Free web version; Premium license is $24/year and a Commercial license is $240/year
Solid modeling: Yes
Intended for: Beginners and amateurs
What makes it special: Models are created through “slashing” 3D blocks away to shape them as desired.

3D Slash focuses on providing design software with a uniquely fun user interface and enough advanced features to work with a high level of precision. You can also make logos and 3D text with this software. 3D Slash is free to use and ideal for beginners, however there a range of price packages that add in features for cooperative use or commercial use depending on the needs of the consumer. Additionally, the free versions has limitations in terms of functions, higher resolutions and colours you can apply. It’s intuitive interface with a block cutting style to create shapes makes it simple enough for anyone to use.

Even if you can’t find the creative spark to start a design from scratch, there are a multitude of files available for download that you can import and then cut apart into something new. Novel features like the cursor mode that makes interior designing much easier are great additions. Aside from its ability to run on standard mode, it an can also be used with VR head sets. While the blockish style can be limiting in terms of range of shapes one can make and less pleasing to the eyes, it is nonetheless efficient and practical. There are few software that are as quick from concept to finish as 3D slash.

SketchUp

Price: Free web version; Pro version is $299/year
Solid modeling: No
Intended for: Beginners to advanced users
What makes it special: Intuitive and powerful, with a library of user-generated and manufacturer-produced models.

SketchUp is another good modeling software because it maintains that balance between usability and functionality, making it ideal for most skill levels. The software has an easy learning curve and there are advanced features available for professionals at an extra cost. It is especially good for designing interior and exterior architectural projects but also has tools for a diverse range of other purposes.

Anything complex can take quite a while, but simpler designs aren’t too time-consuming. A freeware version, SketchUp Make, and a paid version with additional functionality, SketchUp Pro, are also available.

Fusion 360

Price: Free for personal use and startups, $595/year for commercial license
Solid modeling: Yes
Intended for: Amateurs to professionals
What makes it special: Lots of features, such as tools modeling and sculpting, generative design, simulation, assemblies, collaboration, 3D printing, and CAM.

This is a unique addition to the list of 3d printing software tools. Fusion 360 is a cloud-based 3D CAD program that utilizes the power of the cloud to bring design teams together and collaborate on complex projects. Another advantage of the cloud platform is that Fusion stores the entire history of the model including the changes to it. Numerous design options are available, including freeform, solid, and mesh modeling.

Fusion 360 operates on a monthly payment subscription basis. The developers also regularly update the features, making it better as new instalments come along. It runs on multiple platforms and allows users to access their information wherever they want.

MoI 3D

Price: $295
Solid modeling: Yes
Intended for: Amateurs to advanced users
What makes it special: Can create smooth meshes from CAD models and is pen-tablet friendly.

Short for Moment of Inspiration, MoI offers a sleek UI and powerful range of CAD tools for users specializing in polygonal modeling. The program comes with advanced boolean functions that enable quick design of “hard surface” models. It is a user-friendly software that uses the NURBS modeling system.

While it isn’t free, it is cheaper than some of its competitors. It has a good amount of functions in it, yet avoids being too cluttered with pointless features. The system which uses curves and booleans makes workflow quicker as well.

Rhino3D

Price: $995
Solid modeling: No
Intended for: Advanced users and professionals
What makes it special: Very powerful and full of features for modeling, analysis, rendering, 3D capture, CAM, and 3D printing.

The company behind this software markets it as the world’s most versatile 3D-modeler. The software is available for download in a variety of bundles on their website at various prices. The program uses a precise and mathematical model known as NURB, allowing you to manipulate points, curves, meshes, surfaces, solids, and more in all sorts of ways. Ultimately, given the range of design features available with Rhino3D, it’s hard to argue against its claims about unrivaled versatility in creating complex 3D models.

Users have commented on how the software can be very difficult to learn. This is a natural trade-off between capabilities and user friendly many designers have to make when creating a detailed software. While it is not the most accurate software at capturing user intent, it is one of the best on the market.

Modo

Price: $599/year or $1,799 for Perpetual license
Solid modeling: No
Intended for: Amateurs to professionals
What makes it special: Procedural modeling and artist-friendly tools for modeling, animation, texturing, and rendering.

Modo provides creative 3D polygon and subdivision surface modeling tools with a lot of flexibility, allowing you to create both freeform organic models and precision meshes using the same software. This is a professional-grade program with a range of features designed for advanced 3D designers, and the price reflects this.

Even though it isn’t the most user-friendly software, it hosts a large set of features while running smoothly. The speed of the software is particularly evident in terms of baking textures. It also works with partner software and extensions as additional customisations.

Cinema 4D

Price: $720/year or $3,945 for Perpetual license
Solid modeling: No
Intended for: Amateurs to professionals
What makes it special: An intuitive interface, parametric modeling, and procedural workflow.

This is an extremely powerful 3D modeling tool that lets you create complex 3D designs. Cinema 4D’s quite flat learning curve makes it approachable for beginners intimidated by software with advanced features. The program is regularly updated with free service packs, which help to optimize how it runs on various operating systems.

The user friendly options present the prints in very accessible ways. Scaling and shading options make modeling far easier. It’s sculpting tool is a great example of why this software is ideal for editing models and pre-existing files.

SolidWorks

Price: $1,295/year or $3,995 for Perpetual license
Solid modeling: Yes
Intended for: Amateurs to professionals
What makes it special: Powerful editing tree and tools for manufacturing, assemblies, simulation, cost estimates, CAM, and 3D printing.

Now we move on to SolidWorks. This is a CAD program often used by professional 3D designers. There are a plethora of advanced features included, such as design validation tools and reverse engineering. Solidworks comes in three distinct packages, depending on the exact features you need.

Solidworks tends towards the industrial side of things. It is practical and detailed. While most software, mimic curves through gently inclining flat structures, Solidworks uses a system of nurbs that create averages of the edges to produce fantastically detailed curvatures. It only does away with polygonal modeling, opting instead for dimensional sketching. As a result, resizing becomes far less of a hassle.

Maya

Price: $1,545/year
Solid modeling: No
Intended for: Advanced users and professionals
What makes it special: Procedural effects and powerful world and character creation tools.

Primarily marketed at animation professionals, Maya is useful for many aspects of 3D modeling, especially in terms of mathematically smooth surfaces and shapes. Maya was originally slated as a 3D animation software, but is very useful in 3D printing as well. Thus, a lot of the interface options are more reminiscent of sculpting and animation.

Maya is more applicable to artistic printing requirements. It has a fast rendering engine and is best for highly detailed models with many intricacies. The downside is that it is very expensive (it is, after all, the same software used for high-budget movie CGI|). Nonetheless, it allows for realistic representations of reflection and colour on a software with smooth operation.

3DS Max

Price: $1,545/year
Solid modeling: No
Intended for: Advanced users and professionals
What makes it special: Advanced users and professionals

Another program that focuses on animation, 3DS Max offers some great 3D modeling features such as shading tools, parametric mesh modeling, and polygon modeling. This Windows only software is a favourite among video game developers, many TV commercial studios and architectural visualization studios.

Inventor

Price: $1985/year
Solid modeling: Yes
Intended for: Advanced users and professionals
What makes it special: Tailored specifically for product design and engineering applications and loaded with tools for simulation and manufacturing.

Inventor 3D CAD software offers professional-level 3D mechanical design. The program comes with freeform, direct, and parametric modeling choices. Furthermore, you also get automation and simulation tools.

Developed by Autodesk, Inventor comes in different packages depending on level of proficiency (student, professional etc.). One of the great things about Inventor is how they improve the software with user feedback. New versions include improvements to visual data representation and the ability to easily reference 3rd party designs without the need to convert file formats.

Slicers & 3D Printer Hosts

The second section of this list of the best 3D printing software tools focuses on programs that help you to execute a 3D print. Slicers are the easiest way to go from a 3D model to a printed part because they take a CAD model, slice it into layers and turn the model into G-code. The slicer software also includes 3D printer settings like temperature, layer height, print speed, etc. to the G-code. The 3D printer can read this G-code and make the model layer by layer following the instructions set in the G-code.

Ultimaker Cura

Despite its name, Cura can be used with almost any 3D printer because it is an open-source slicer. The program is ideal for beginners because it is intuitive and fast. Most of all, it’s easy to use. More advanced users can access a further 200 settings to refine their prints.

Simplify3D

Simplify3D is an extremely powerful premium slicing tool that helps you drastically improve the quality of 3D prints. Not only does Simplify3D slice your CAD into layers, it also corrects any problems with your models and allows you to preview the end result, helping to further identify any other issues. Advanced users will need to decide if the premium features are worth paying for compared to open-source slicers.

Slic3r

This open-source software includes real-time incremental slicing, 3D preview, and more. It is one of the most widely used 3D printing software tools. The incremental real-time slicing ensures that when you change a setting, the slicing doesn’t need to start from scratch. Only the G-code for affected parts is recalculated. The end result is a fast, flexible, and precise slicing program.

Repetier

This open-source slicer software supports three different slicing engines; Slic3r, CuraEngine, and Skeinforge. Repetier can also handle up to 16 extruders with different filament types and colors simultaneously, and you can visualize your end result before printing. There is a lot of customization and a lot of tinkering involved, making Repetier ideal for more advanced users. You also get remote access to your printers with Repetier host.

KISSlicer

This slicing software does its job well, although the user interface is somewhat basic. Still, if you just need a slicer that delivers great results, use KISSlicer. Note that the basic version is for single-head machines only. You’ll need a PRO version for multi-head machines.

ideaMaker

This free slicer is distributed by Raise3D and provides fast, simple slicing for most 3D printers. Team members can share print profiles and supports can be automatically or manually placed. The adaptive layer height tool allows the software to adjust layer height depending on the level of detail in the model, maximizing print quality while minimizing print time. Remote monitoring and control is also available.

OctoPrint

A free open-source web-interface that allows for remote control and monitoring of 3D printers. It’s compatible with most 3D printers and allows users to watch their prints with an embedded webcam feed. Prints can be started, paused, and stopped remotely, and plugins are available to track print statistics and send push notifications on job progress.

3DPrinterOS

This nifty cloud 3D printer management software comes at a cost. The essential idea is the management of the entire 3D printing process with one platform. Users can edit and repair designs, slice STL files from the cloud, and even send files for printing from anywhere in the world. The software also features the capability to share CAD files.

90,000 programs for modeling and printing on a 3D printer

Content

- Program programs
- File types for 3D printing
  - Free programs
  - Paid programs for 3D modeling
  9000
- Programs for cutting 3D models (slicers)
  - Free slicers
  - Paid slicers
- To summarize

The whole cycle of creating a part on a 3D printer can be fit into three stages: Creating / finding a model, cutting a model in a slicer, printing on a 3D printer. Each stage is tied to its own program. Models are created in special programs, then in the slicer the model is “cut” into steps that the printer will sequentially execute. The resulting list of steps (commands) is either placed on a memory card and run from the printer itself, or sent to the printer via a wired/wireless connection. As a result of all these actions, we get the product. Therefore, looking for a “3D printer program” is wrong: you need to look for a modeling program and a slicer.

3D modeling software

Programs for 3D modeling are divided into two large groups:

Obviously, when creating a drawing, an engineer needs precise tools: a ruler, pencil, compass, etc. But the artist needs more free tools: brushes, pastels, palettes and others. Programs are divided according to the same principle: in engineering programs, there are all the tools that allow you to accurately specify the characteristics of each element of the part, and in art programs, tools are created to give smoother forms so that the model looks as natural as possible. Of course, in art programs it is possible to model technical products, but this is comparable to drawing a drawing with pastel: it is inconvenient, difficult and inaccurate. Therefore, it is very important to determine why you need a simulation program.

Tip: It is best to learn one or two programs at a professional level, as this will allow you to create complex models. But you should also know the basics in other programs, since a large circle of knowledge allows you to more flexibly choose the approach to creating models.

File types for 3D printing

To begin with, it is worth understanding what types of files are involved in the manufacturing process of the part. The first step is to create a model. It can be saved in the format of the program itself (for example, KOMPAS-3D files have the .m3d extension, while 3ds Max has the .MAX file extension). Such files can only be opened in the programs in which they were created. But we need a universal format - STL. All programs can save models in this format. It stores the polygons that create the model.

All files are divided into 3 categories:

Files that store polygonal information (STL, OBJ, etc.). They are analogues of a raster image. It is possible to increase the quality of 3D models in this format only by smoothing, but in this case small details will be lost, and the file weight will increase greatly.
Files that store the steps for creating a part (STEP, STP, etc.). Here you can draw an analogy with vector images. Each element is specified either using simple dot connections (for example, as in a cube or pyramid), or using formulas (any curved, rounded objects). Models in this format can be scaled without loss of quality, while maintaining a relatively small file size.
Utility files that store steps for a 3D printer (GCODE, GCOD). These files store the commands that the printer executes and, in some cases, comments (for example, with what settings the model was cut). Some slicers can simulate the movements of the printer, thereby rendering the model, but it is impossible to convert a file from this format to a full-fledged model.

Be careful! If you are not sure that the GCODE file is intended for your printer, then you should not print it, because the print area for each printer is different. On third-party firmware there is no limit on the maximum travel distance, some third-party software commands may lead to incorrect operation of the control board. If the printer tries to move the print head out of the printable area many times, then it can harm itself!

If the files are in the same category, then they can be easily converted from one format to another with almost no data loss. The formats indicated in brackets are a kind of “transits”. For example, Inventor has its own file format - itp, and Fusion 360 has its own - f3d. But if you save the file in Inventor in the generic STEP format, you can open it in any engineering program and then save it in that program's format.

Free programs

Usually, free programs are either limited in functionality or created by enthusiasts, which is why they have a very crooked interface and a lot of errors. But their functionality is enough to create simple models, and in some cases, such programs can completely replace paid software.