OpenSCAD files and some sample stl of a couple of different caps to go on posts for some wire shelves I have. There is a simple cap that is just a cover for the top of the post and a more complicated cap I can mount other things to with an M3 bolt to connect them. The other thing I have included here is a cylinder with slots for holding USB cables.

More pictures and info can be found at https://tomhorsley.com/hardware/corexy/gallery-cap.html

I printed these in PETG, not sure the little "vanes" would be flexible enough to secure the cap in other materials.

DIY corexy homebuild printer

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.3mm

30%