When I attached our children’s swing to the ground there was still a significant piece of sharp-ish threaded metal sticking out above the bolt head and I was worried about them falling on it. Grinding the end off might still leave some sharp parts, so I thought it safer to print plastic covers for them.

Sharp bolt end protruding from the ground

Screenshot of bolt cap design in OpenSCAD

Screenshot of gcode printing plan

Photo of 3D printed bolt cap

I designed the caps with OpenSCAD, using the ScrewsMetric library for the bolt-shaped inset.

You can see the source code for Continue reading →