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This is a simple block I whipped up on tinkercad to help my daughter learn to pedal her new bicycle. Print two of them and place one under each training wheel. The socket is slightly too small for her training wheels but it still functions perfectly fine, manipulate the size as you wish.

This really helped ease her frustration at learning how the pedals work, because she didn't have to worry about the actual riding part. She quickly got the hang of it afterwards.

Material probably doesn't matter, I used PETG at 15% infill.