MityVac Valve cap screw for fluid evacuator.

thingiverse

I printed this upside down with the mushroom cap screwed onto the build plate, ensuring minimal supports are needed for printing. By attaching the threads directly to the shaft assembly's threaded rod, you can secure it firmly in place, but be cautious not to overtighten. A high infill setting, around 60%, is recommended to prevent the print from breaking when assembling the cap screw onto the shaft. This was my first-ever print and design, surprisingly successful considering I'm a beginner.