M10x1.0 hose barb

thingiverse

This is a custom fitting for bleeding a brake master cylinder that screws into the port on the master cylinder, allowing you to run a piece of tubing back into the reservoir. It features M10 x 1.0 mm threads on its body and a barb sized specifically for 3/16" ID tubing. I fabricated it using 0.10 mm layer height and 100% infill with PETG material, and it screwed in perfectly. I'm including the Fusion 360 file so you can modify it as needed.