Prankapult by HardlyForeal

Last crawled date: 3 years, 1 month ago

This is a modified version of thing:1381027.
I try to take a purist route and don't think a 3d printed object should need glue or welding if at all possible. I've modified it to snap the supports onto the base, and to use c-clips to hold the supports together. I tried to use split snap posts for the connection between support A and support B, but the layer adhesion isn't good enough at this size, and the tabs just break. So I added the C-Clips, and they hold with plenty of strength.
Note the orientation of the throwing arm to Support A during assembly, shown in the first image. The throwing arm is installed in that position and then wound before installing the base. Assembly is the same as the video at the original thing except for snapping and using the c-clips instead of welding with a soldering iron or gluing.
I also modified the size of the hole in the spring to provide less clearance, and therefore less chance of it spinning passed the corners.
Because the ammo basket requires bridging in the through-hole, the insertion of the throwing arm may be rough, but should fit. But if it doesn't fit for some reason, wedging the basket on works just as well (which is what I did before I expanded the clearance).
When printing, I printed Support A, the spring/throwing arm, and the c-clips solid. I set the infill pattern and top and bottom layer patterns to "concentric" to add as much spring and as little chance of fracturing as possible. Everything else I printed at a 10% infill.