Vapor and Liquid valve knobs / handles for Worthington refrigerant cylinder, mine is on a RobinAir recovery machine. The knobs on my tank were hard to use because they were tiny. Also, the seals on the valves were bad so I broke one handle trying to back-seat the valve.

These knobs fit very tightly, and will probably need to be hammered onto the valve stems. Because I designed this to print without supports, the top of the valve stem hole is not flat, so the stem won't fully sit against it. Over-tightening the handle screw could break the print.

Incidentally, the O-rings on my valves were deteriorated. They were easy to change, the knobs must come off, and the valves have a left-hand thread.

Creality

Ender 3

No

No

0.2

50%

I used a 5-line wall thickness to give extra strength around the valve stem. I was able to print without supports.