How to make strong 3d prints

3D printing is a popular method used for its quality, efficiency, and effectiveness, and its ability to make complex parts. However, improving strengthening a 3D print comes with advanced knowledge on how a 3D printer works, the right material to use, and post-processing techniques.

If you desire a 3D print with the right attributes in the form of strength, durability, aesthetics, and quality, partnering with RapidDirect, one of the best rapid prototyping services in China, is a great choice. We provide custom 3D printing services, and you can get an instant quote for custom machined parts and full-dimensional reports inspection reports. For anything related to 3D printing, contact us today.

Get an Instant Quote For 3D Printed Parts

How do you reinforce PLA 3D prints?

PLA is one of the most frequently used materials in 3D printing. It has a huge tensile strength making it suitable for making structural parts. While strong, you can also reinforce PLA 3D prints using the methods highlighted above. Common methods of strengthening the 3D prints include applying epoxy, annealing, or electroplating.

What is the strongest 3D printable material?

Among all the printable materials used in 3D printing, polycarbonate is the strongest. It was dubbed the true king of desktop printing due to its strength (tensile strength of 9800 psi) and heat resistance. The heat resistance makes it require extraordinarily high temperature (bed should be at about 145⁰ while the head should be at about 290⁰. You will also need to enclose the material due to it warping in an open environment. Polycarbonate is suitable for making high-strength functional components.

How do I make prints stronger?

There are many ways you can use to make prints stronger. You can tweak your 3D printer’s setting, you can change the materials to stronger materials, and you can use after-processing methods such as coating with epoxy materials, annealing, and electroplating.

11 Ways How To Make 3D Printed Parts Stronger – A Simple Guide – 3D Printerly

3D prints have many functional uses which can require a good amount of strength to perform properly. Even if you have some aesthetic 3D prints, you’ll still want a certain level of strength so it can hold up well.

I decided to write an article detailing how you can make your 3D printed parts stronger, allowing you to have more confidence in the durability of objects you are making.

Keep on reading through to get some good tips on how to improve and strengthen your 3D prints.

The main cause of brittle or weak 3D prints is the accumulation of moisture in the filament. Some 3D filaments naturally tend to absorb moisture from the air due to overexposure. Trying to heat filament to a high temperature that has absorbed moisture can cause bubbles and popping, leading to weak extrusion.

What you want to do in this situation is dry your filament. There are a few ways to dry filament effective, the first method being to put your filament spool in an oven at low heat.

You first have to make sure your oven temperature is correctly calibrated with a thermometer because oven temperatures can be quite inaccurate, especially at lower temperatures.

Another more popular method is to use a specialized filament dryer like the SUNLU Filament Dryer from Amazon. Most people who use this are very happy with their results, being able to save filament they thought were no longer effective.

There have been a few mixed reviews though with people saying it doesn’t heat up enough, though these may be faulty units.

One user who 3D prints Nylon, which is notorious for absorbing moisture used the SUNLU Filament Dryer and said his prints are now coming out clean and beautiful.

I’d recommend that you use an extra layer of insulation like a large plastic bag or a cardboard box to retain the heat in.

Other factors that may contribute to a soft, weak, and brittle print is the infill density and wall thickness. I’ll take you through the idea methods to improve strength in your 3D prints below.

1. Use Stronger Materials

Instead of using materials that are known to be weak in some cases, you can choose to use materials that can hold up well with strong forces or impact.

I’d recommend going with something like Polycarbonate with Carbon Fiber Reinforcement from Amazon.

This filament is gaining plenty of traction in the 3D printing community for providing real strength in 3D prints. It has over 600 ratings and is currently at 4.4/5.0 at the time of writing.

The best thing about this is just how easy it is to print compared to ABS, which is another stronger material that people use.

Another widely used filament that people use for functional 3D prints or for strength in general is OVERTURE PETG 1.75mm Filament, known to be a little stronger than PLA, and still pretty easy to 3D print with.

2. Increase Wall Thickness

One of the best methods to strengthen and reinforce your 3D prints is to increase your wall thickness. The wall thickness is simply how thick the exterior wall of your 3D print is, measured by “Wall Line Count” and “Outer Line Width”.

You don’t want a wall thickness less than 1.2mm. I’d recommend having a minimum wall thickness of 1. 6mm, but for more strength, you can definitely go higher.

Increasing wall thickness also has the benefits of improving overhangs as well as making 3D prints more watertight.

3. Increase Infill Density

The infill pattern is the internal structure of the object being printed. The amount of infill you need depends mainly on the object you are creating, but generally speaking, you want an infill of at least 20% for good strength.

If you want to go the extra mile, you can raise it up to 40%+, but there are diminishing returns to increasing infill density.

The more you increase it, the less improvement in strength you’ll get in your 3D printed part. I’d recommend first increasing your wall thickness before increasing infill density so high.

Generally, 3D printer users don’t exceed 40% unless they need some real functionality and the print will be load-bearing.

In many cases, even 10% infill with a Cubic infill pattern works pretty well for strength.

4. Use a Strong Infill Pattern

Using an infill pattern built for strength is a good idea to reinforce your 3D prints and strengthen them. When it comes to strength, people tend to use Grid or the Cubic (Honeycomb) pattern.

The Triangle pattern is really good for strength too, but you will need to have a good top layer thickness to get an even top surface.

Infill patterns work closely with infill density, where some infill patterns at 10% infill density will be much stronger than others. Gyroid is known to perform well at low infill densities, but it isn’t a very strong infill pattern overall.

Gyroid is better for flexible filament and for when you might use dissolvable filament like HIPS.

While you slice your 3D print, you can check out how dense the infill actually is by checking the “Preview” tab.

5. Changing the Orientation (Extrusion Direction)

Simply placing the prints horizontally, diagonally, or vertically on your  print bed can change the strength of the prints due to the direction that the 3D prints are created.

Some people have run tests on rectangular 3D prints that are oriented in different directions, and found significant changes in part strength.

It’s mainly to do with the build direction and how 3D prints are built through separate layers that bond together. When a 3D print breaks, it’s usually going to be from a separation of the layer lines.

What you can do is figure out which direction your 3D printed part is going to have the most weight and force behind it, then orient the part to not have layer lines in that same direction, but opposite.

A simple example would be for a shelf bracket, where the force is going to be pointing downwards. 3D-Pros showed how they 3D printed a shelf bracket in two orientations. One failed miserably, while the other stood up strong.

Instead of having the orientation flat on the build plate, you should 3D print the shelf bracket on it’s side, so its layers are built across rather than along the part which has force on it and is more likely to break.

This can be confusing to understand at first, but you can get a better understanding by seeing it visually.

Check the video below for guidance on orienting your 3D prints.

6. Adjust Flow Rate

Adjusting your flow rate slightly is another way to reinforce and strengthen your 3D prints. If you choose to adjust this though, you want to make fairly small changes because you can end up causing under extrusion and over extrusion.

You can adjust the flow for specific parts of your 3D print such as the “Wall Flow” which includes the “Outer Wall Flow” & “Inner Wall Flow”, “Infill Flow”, “Support Flow”, and more.

Though, in most cases, adjusting the flow is a temporary fix for another issue so you would be better to directly increase line width rather than adjust flow rates.

7. Line Width

Cura, which is a popular slicer mentions that adjusting your line width to an even multiple of the layer height of your print can actually make your 3D printed objects stronger.

Try not to adjust Line Width too much, similar to the Flow Rate because it can lead to over and under extrusion again. It’s a good idea to adjust print speed to indirectly adjust the flow and line width to a certain extent.

8. Decrease Print Speed

Using a lower print speed, as mentioned above can increase the strength of 3D prints because it can leave more material behind to fill in any gaps that would occur if the speed was too high.

If you increase your Line Width, you want to also increase Print Speed to keep a more constant Flow Rate. This can also improve print quality when balanced correctly.

If you do decrease your print speed, you may have to decrease your printing temperature to account for the increased period of time your filament will be under heat.

9. Reduce Cooling

Cooling parts too quickly can lead to bad layer adhesion since the heated filament doesn’t have enough time to properly bond with the previous layer.

Depending on what material you are 3D printing, you can try to reduce your cooling fan rate, so your parts can bond together strongly during the printing process.

PLA works best with a fairly strong cooling fan, but can try to balance this with printing temperature, print speed, and flow rate.

10.

The use of thicker layers leads to better adhesion between layers. Thicker layers will present more gaps between the adjacent parts of the layers. Tests have show that larger layer heights have been observed to produce 3D prints that are stronger.

A layer height of 0.3mm has been shown to out-perform a layer height of 0.1mm in the strength category. Try using a larger layer height if print quality is not essential for the specific 3D print. It is also beneficial because it speeds up printing times.

Check the video below for more details about strength testing for different layer heights.

11. Increase Nozzle Size

Not only can you decrease the printing time of your 3D prints, but you can also increase the strength of your parts by using a larger nozzle diameter like 0. 6mm or 0.8mm.

The video below by ModBot goes through the process of just how much faster he could print, as well as the increased strength he got from the increase in layer height.

It’s related to the increased flow rate and increased layer width, leading to a more rigid part. It also improves how smoothly filament can extrude and create better layer adhesion.

Annealing 3D Prints

Annealing 3D prints is a heat treatment process of putting 3D printed objects under an increased temperature to strengthen its integrity. With some testing, people have shown increases in strength of 40% according to Fargo 3D Printing’s testing.

You can check out Josef Prusa’s video on annealing, where he tests 4 different materials – PLA, ABS, PETG, ASA to see just what kind of differences occur by annealing.

Electroplating 3D Prints

This practice is becoming more popular because it is practical and affordable. This involves immersing the printing part in a water and metal salt solution. Electric current is then passed through it, thus causing metal cat-ions, like a thin coating, to form around it.

The result is durable and long-lasting 3D prints. The only downside is that many layers may be required if you want a stronger print. Some plating materials include Zinc, Chrome, and Nickel. These three have the most industrial applications.

What this does is simple, to orient the model such that the weakest point, which is the layer boundary is not so exposed. The result is stronger 3D prints.

For more on electroplating 3D prints, check out the video below.

Check out another great video on electroplating, with simple instructions on how to get great finishes on your models.

How To Strengthen Finished 3D Prints: Use of Epoxy Coating

When you are done printing the model, an Epoxy can be applied correctly to strengthen the model after printing. Epoxy, also known as polyepoxide is a functional hardener, used to make your read-made model stronger.

With the aid of a brush, gently apply the epoxy coating to the 3D prints in a way that the epoxy will not drip down. Use smaller brushes for crevices and hard to reach corners so that every part of the exterior is well covered.

A very popular 3D printing epoxy coating that tons of people have had success with is the XTC-3D High Performance Print Coating from Amazon.

It works with all sorts of 3D printed materials like PLA, ABS, SLA prints, as well as even wood, paper and other materials.

A kit of this epoxy is very long-lasting because you don’t need to use much at all to get good results.

Many people say “a little goes a long way”. After the epoxy cures, you get some extra strength and a lovely clear and shiny surface that looks great.

It is a simple thing to do, but if you would like to know more about applying an epoxy coating to 3D prints, check out the video by Matter Hackers.

How to Strengthen Resin 3D Prints

To strengthen resin 3D prints, increase the wall thickness of the model if it’s hollowed out to around 3mm. You can increase durability by adding around 25% flexible resin to the resin vat so it has some flexible strength. Make sure not to over cure the model which can make resin brittle. 

How to 3D print something (even if you don't have a 3D printer)

3D printers are amazing tools that allow you to create just about any physical object you can think of (or at least design in a 3D modeling program). One downside? They are stupidly expensive and you probably can't justify the cost. Luckily, you don't need to have one to print your material - there are many services that will do it for you.

RELATED: When should you buy 3D printers for home use?

There are many reasons why you might want to 3D print something, but few that justify it. You can print anything from a dedicated GPS mount for your bike to Dungeons & Dragons miniatures and wearable armor for your next Star Wars cosplay. Unless, of course, you'll be printing tons of stuff on a regular printer, none of them are worth the hundreds you have to spend on a 3D printer (or the thousands you'd spend on a really good one).

To help people like you who want to print materials but don't want to spend tons of money on perks, services like Shapeways, Kraftwurx, Ponoko and 3D Hubs have made 3D printing available even if you don't have your own printer . Some offer 3D model stores that you can print directly, or you can download models you made yourself or found online. Each service is slightly different, so we'll take a look at each and highlight the strengths and weaknesses of each.

Shapeways allows you to shop for 3D printing in a ton of materials or upload your own

Shapeways is one of the largest and one stop shop for 3D printing. The company has a significant community of 3D modelers and designers who upload their creations for all tastes. You can head to the Shapways store to find jewelry, phone cases, Raspberry Pi parts, desktop gaming accessories, and more. The models you find there are designed to print with no problems, and each model is tested by Shapeways staff to ensure they are structurally sound. 3D printable models need to be made with the utmost care to ensure that the parts are thick enough to not break, and to avoid a host of other issues that most of us don't think about. Some patterns, such as key chains and pendants, are even customizable so you can add your name or personal message.

You can also get prints on various materials. If you've ever seen something that has been 3D printed, it's probably plastic. Shapeways offers engravings in steel, bronze, brass, silver, gold, wax, porcelain, aluminum and several types of plastic. Of course, not every model is available in every material. Some models will print well on plastic, but will fall apart if made from metal or porcelain. However, it's amazing to get a stainless steel dice set without buying a printer.

Shapeways 3D prints are made to order. Because the company uses industrial printers that can produce hundreds of models at once, the prices for what you get are relatively low. For simple plastic prints, you can spend as little as $10 on basic figurines. Even some metal jewelry or trinkets can cost as little as $25, although metal is clearly more expensive than plastic. In general, the larger the print, the more expensive it will be. However, you will have to go for something quite large to compete with the cost of buying a 3D printer that can print at comparable quality.

If you can't find a model for something you want on Shapeways, you can upload your own. However, things get more complicated when you do this. For example, you can find 3D models on sites like TurboSquid, but they are not necessarily meant to be printed. Sites like Thingiverse offer 3D printable models, but they are not tested for printability. You may still find that the design you upload has too thin walls or prints incorrectly. That's fine if you're used to 3D modeling on your own, but for amateurs, you might run into trouble. To help deal with this problem, Shapeways offers a directory where you can hire a designer. Obviously, this will be more expensive than finding a finished print, but if you really need a professional's opinion, you can find it in the Shapeways community.

Speaking of which, Shapeways' main advantage over the other services on this list is its community. Whether you're looking for a finished model or need help building something special, you're likely to find someone to help. Shapeways also offers some of the best prices on single prints. Many 3D printing companies aim to print a large number of products for small companies and are priced accordingly, which leaves their services beyond the reach of the average person. Shapeways is one of the few that allows the average person to place a one-time order for cheap dudad without emptying their wallet.

Kraftwurx is also worth mentioning along with Shapeways as they have a very similar business model. Kraftwurx has a wider selection of materials than Shapeways, but is not as sustainable as the community. For 3D modelers, their tools are a little clunky. However, if you just want to find a model and print it right away but can't find it on Shapeways, Kraftwurx is worth a look.

3D Hubs finds local printers that can make your project

Most people don't need to buy a 3D printer, but many people who buy a high quality 3D printer for thousands of dollars do so to start a business selling prints to other people. 3D Hubs will help you find those people or small companies that can do whatever you want. Although "nearby" is a relative term. 3D Hubs will look for printers halfway across the country if necessary to find a good printer, but that will likely be closer than ordering from a manufacturing facility in Europe.

The result of 3D Hubs is that you can shop around. Some of the "hubs" (as each printer is called) on the site are nothing more than a seasoned enthusiast owning their own printer. Others are small companies with large manufacturing facilities that can handle more complex requests. You can compare prices and services from dozens of different companies to see who can offer you the best price and print quality.

The downside is that 3D hubs don't offer much in terms of quality control on their own. Unlike Shapeways, no one at 3D Hubs looks at your model to make sure it's ready to print and has no major flaws. The computer scans the file for basic errors, but there is no human in the loop to make sure it works. The center you hire to print should do the job, but the quality could hypothetically vary from one company to another. It's a bit like shopping on Etsy. you will probably get a good product, but there is always a chance that you will get something that is rubbish.