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I don't have a metal shop unfortunately but I made a ton of 3D printed things for bikes.
My best design so far is a flexible bar mount smartphone holder, pic rel.
Also made
Bracket for bell
Decorative bash guard
Valve caps
Bottle holder brackets
Excentric spacer to correct FD offset
Mount for head light, which I ripped off a trashed bike in the street
Currently working on a smiley faced rear light