Old School BMX 20" frame/fork head tube bearing cups
thingiverse
Designed for use with frame and fork sets that are for display. The sizing is is very close to actual bearing cup size but loose enough that no force is needed to install them. If they do not fit at 100% scale, then check your e-steps for extrusion, or try again at a slightly smaller scale if too large, or, bigger if too small.
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