Simple and small "screws" or fixation pins

If small (2 - 4 mm) screws should be printed and you fail with the thread, this alternative could be considered.
0m
1× print file
0.20 mm
0.40 mm
0.00 g
8
23
0
914
updated August 19, 2021

Description

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Often multiple parts need to be assembled. This is often done by screws. Screws (threads) bigger than M4 can quite easily be printed. But smaller threads are not that simple to print. 

So this fixation pin is introduced, which is optimized to FDM printing. It can easily be printed and the holes can simply be integrated in the part without the need of a thread. The mechanism is rather simple. It uses the surface of the printed part as the “toothing” between the parts. When assembling the part, the pin is just placed in the hole (in the right orientation) and then turned 90°. In the same way it can also be easily opened again. Nevertheless, it misses the function of pulling the parts together when the screw is tightened. But in most cases, this can be done by pushing the parts together when they are assembled.

The design is so simple, that it can easily be implemented in your designs. Maybe you just have to test the accurate diameter of the pin. For me it works best, when the lager diameter of the pin is +0.1 mm bigger than the smaller diameter of the hole. I have tested it for diameters 2, 2.5, 3 and 4 mm.

The parts are printed on a Prusa MK 2.5s and sliced in PrusaSlicer with the standard parameters for 0.2 mm layer height.

Hope, this idea could help solving some problems. Happy printing…

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