14-20 Male to 12mm Female Straight Adapter
cults3d
I had a 14/20 funnel that I wanted to attach a 12mm tube to, so I quickly made an adapter, Best printed in TPU for the best seal. Hole in the middle is 5mm Dia. if you need to you can scale the part up a little to work with your printer. Or or remove part of the bottom 20mm to help fit into a larger 16mm or 18mm funnel this can easily be done in your slicer. Widest diameter is just under 16mm, so be warned it probably wont fit anything that has a minimum diameter higher than this.
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