Front Handlebar Bicycle reflector bracket. Handle bar diameter approximately 22.5mm in diameter. This isn't a universal reflector mount but yours may be like mine and will be useful for you.

LulzBot

TAZ 6

No

Doesn't Matter

0.25

100%

Any 3D printer, any material except flexible. I printed this with PLA and was still able to split it around the handlebar without breaking. Screw hole diameter is 5.25mm, screwhead hole is up to 9.75mm. Hexagon nuts are 8mm from end to end.