Schrader to presta valve adapter
thingiverse
Schrader to presta adapter (roughly, car tire valve to bicycle tire valve), for my presta and schrader cap collection: https://www.thingiverse.com/xxmtx/collections/38672306/things Force it into the schrader hole, and you have a presta cap. The thread form when screwing it first time. Tolerance is pretty tight. V11: Wider body plus a slit and a chamfer on the top, for an easier and better fit in the presta hole. The closing of the slit at the bottom, is for having the brim only outside, otherwise my slicer can't get it right.
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