Gravity Screw

This model has tight tolerances (0.14 mm), so don't shorten it the along the X or Y axes. Shortening it along the Z axis may work, but might cause it to work poorly. The lid has an even tighter tolerance to help it fit very snugly.

Use as more infill to make the ring heavier and fall more smoothly. A smaller layer height will work better. 25% infill, 3 perimeters, and a 0.1 mm layer height was just enough for it to work well for me.

(I don't have a picture of the model because it was last seen being chewed on by a dog)

(I don't have a dog)

(Edit: found it. Took a picture, but I'm not touching it anymore)