SUP-Valve to Schrader-Valve (car tire valve) Adapter

thingiverse

I've got an inflatable body board that's perfect for air travel, except the pump is too bulky to carry with me. So I came up with a clever solution - an adapter on a Schrader valve that lets me inflate my board using a small bike pump. You can use this adapter for SUP boards or boats too, but I'd recommend investing in a compressor instead of a bike pump. Unfortunately, I only realized afterwards that you can buy the same adapter on Amazon for around $4.50! If you want to try it out anyway, you'll need a Schrader valve. I salvaged mine from a broken bicycle tube. The Schrader-valve part tends to break at the bayonet lock, but it works best with PETG filament. ASA and PLA are too brittle for this application. To avoid any issues, set your slicer to print 100% infill so that the bayonet lock is completely made up of walls. Also, print this part upside down with the thread facing upwards. The other part needs to be printed right-side up, but you can use the original hose that comes with the pump as a substitute for the Schrader-valve part since they have the same two-start 30mm thread. For the seal, I used TPU filament and printed it at 2mm thick. You may need to experiment with different heights until you find one that fits properly - not too thick or it'll be too tight, but not too thin either or it'll leak. Alternatively, you can cut a seal from an old bicycle tube.