Openscad 3d printer

Before you save your 3D model as an STL file, you need to render it. You can find two icons on the User Interface or press F6. Technical information will appear in the Console when the render is ready.

The last step is to click on the ‘’Save as STL’’ icon, a dialog window will then appear for you to choose the correct folder. An STL file is the most commonly used file type used for 3D printing. It’s a format that every 3D printer will understand and it’s the best choice to avoid any issues while 3D printing.  

Now that you model was exported as an STL file we can move on to the last step.  Upload your STL file to our 3D printing service and get it 3D printed! If you run into any troubles, don’t hesitate to contact our customer support.  

Modeling a four-shot fisted revolver in OpenScad

Creativity

Flyingbear Ghost 5

One day in Science and Technology, I came across an article about the history of hidden weapons. At this time, my friends and I came up with different models of devices with a trigger mechanism in order to compete in firing range. I really liked one of the models of the fist revolver - "Le Protector". I decided to make myself a similar mechanism that shoots plastic bullets. I read various literature about this revolver, I understood the principle of its operation. But, of course, I could not do exactly the same, and there was no point in this. I do not need a combat weapon, but only its equivalent, capable of firing light plastic bullets. I decided to design the mechanism of my gun myself and make it out of plastic using a 3D printer. The Le Protector revolver was developed in 1882 by the Frenchman Jean Edmund Turbot in Paris. This revolver served for self-defense. Unlike other fist pistols, such as Andre Manatos' wounding weapons or Charles Cash's melee weapons, the Le Protector is a repeating shot. In different models, the number of cartridges ranged from 7 to 10. To fire the Le Protector, you should grab your hand so that the barrel protrudes between your fingers, and the lever can be pressed with your palm. When pressed, the turret rotated, the trigger was released, and the shot was fired. The disc cover was easily removed and access to the cartridge magazine was opened. Turbot described his invention as “A revolver that can be held in the hand so that nothing but the barrel protrudes” (Fig. 1). Fig.1. Fist revolver "Le Protector" "Le Protector" is a unique weapon both in appearance and design. The trigger is located in the center of the body of the pistol. The button on the barrel is not a trigger, as it might seem at first glance, it is a safety that must be pressed for the normal operation of the firing mechanism. The trigger is a lever located on the back of the pistol frame. In order to better hold the revolver in the palm of your hand, protrusions began to be placed on the case disc. Description of the design and principle of operation of the mechanism of my revolver The main condition in the development of the design of the revolver was its compactness. It was necessary that the revolver completely fit in the palm of your hand and it was convenient to pull the trigger with one hand. According to my calculations, the outer size of the revolver body should be 70 mm. A trigger drum with shock springs must be placed in the body, which will push the bullets into the barrel of the revolver. The drum must be on the axle and rotate freely in one direction. In order to prevent the drum from rotating in the opposite direction, a flexible latch (spring plate) must be provided, which, in addition, also fixes the drum in the firing position. The barrel is part of the revolver body and its axis coincides exactly with the axis of the shock springs during the shot. I decided to make a four-shot in-line version of the revolver, where the shock springs in the trigger drum are located at an angle of 90, forming a cross. Figure 2 shows a sketch of my revolver. Fig.2. My sketch of a Le Protector type revolver: 1 - lower body; 2 - trigger drum; 3 - trigger; 4 - pusher tube with a return spring; 5 - trunk; 6 - shock spring; 7 - bullet; 8 - body of the upper part; 9 - flexible latch. I came up with the work of the trigger as follows. To rotate the trigger drum, it has four stops. In the body of the revolver, a pusher in the form of a flexible tube is inserted through a special hole. The end of the pusher rests against one of the stops of the drum. The other end of the pusher is attached to the trigger. When the trigger is pressed, the pusher rotates the drum with bullets inside the revolver body and when the axis of one of the four shock springs with a loaded bullet coincides with the axis of the barrel, a shot occurs. In order to shoot again, you need to release the trigger. Then the pusher under the action of the return spring will partially come out of the housing. The drum, having made a rotation at the first shot by 90, will substitute the next stop under the pusher. By pressing the trigger again, the mechanism of the shot will repeat. Creating 3D models of revolver parts I decided to make the main parts of my revolver out of plastic using a 3D printer. To do this, I first needed to build 3D models of all the parts of the developed revolver and determine the exact dimensions. I found four suitable shock springs. Knowing the external size of the case (about 70 mm), I calculated other important dimensions of the main parts: drum, barrel, seat for springs, the size of the pusher and stops, the size of the trigger, its attachment point. I used the OpenSCAD program to develop models. In this program, you can create 3D models of each part programmatically (using command-operators), as well as create assemblies. With the virtual assembly of all parts together, you can determine the final dimensions, identify inconsistencies and problem areas of the mechanism. After several revisions and alterations of individual parts, I got a finished 3D assembly of the revolver, as well as 3D models of all the parts separately. Fig.3. Working screen of the OpenSCAD program. When working with the OpenSCAD program, I used the following functions and operators: Cube - creating a rectangular box with selected dimensionsSphere - creating a sphere of any radius Cylinder - creating a cylinder or cone with any radius and heightPolygon - creating a two-dimensional object of any shape by points Linear_extrude - extruding a two-dimensional object Rotate – rotation of an objectScale – stretching or shrinking an objectDifference – subtraction of objects (boolean operation) Intersection – intersection of objects (boolean operation) Union – union of objects (boolean operation) Translate – movement of an object The figures show some models of the details of the developed revolver. Fig.4. 3D models of revolver parts created in the OpenSCAD program. a) - the lower part of the body; b) - trigger drum with stops and places for shock springs; c) - the upper part of the body with the barrel; d) - the design of the revolver assembly. The OpenSCAD 3D modeling program allows you to export the developed models to an STL file. This type of file is suitable for preparing models for printing on a 3D printer. I have a FlyingBearGhost5 3D printer. This is a standard type of printer for 3D printing with various plastics by layer-by-layer fusing. In the Cura program, you can select the print quality of the model, the thickness of one layer, the type of plastic used, plastic feed rates, type of support, etc. As a result, the Cura program generates a G-code file that contains the coordinates in the XYZ system of the printer for the print head for each layer of the model. Figure 5 shows the printed parts of the revolver. Fig.5. Finished parts of the revolver. a) - the lower part of the body; b) - trigger drum with shock springs; c) - the upper part of the body with the barrel; d) - assembled revolver and bullets. In order to load my revolver, it is necessary to remove the cover, pull the shock spring on the drum with your finger and get the bullet with the pointed end out. Repeat this for all four bullets. Then close the lid and shoot. Never shoot people or animals! It is forbidden! The average range of a bullet from my revolver is about 2.5 meters. To find out if my revolver is safe, I decided to determine the muzzle energy. Muzzle energy - the initial kinetic energy of the bullet at the time of departure from the barrel. To calculate it, I determined the average weight and speed of the bullet. The maximum muzzle energy of my pistol was 0.012 J. According to the legislation of the Russian Federation, devices with a muzzle energy of less than 3 J are not considered weapons. In buildings, it is acceptable to use a game device with a kinetic energy of less than 1.4 J. Thus, my revolver can be considered a safe toy.

Fig.6. Appearance of the finished fist revolver

3Dsummer2022

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