Cylinder

It requires 4 or 5 3/8" ball bearings, and 1 (5/8" x 1-9/16") spring. The outside of the cylinder is marked with lines representing 5 increments each. The correct orientation to solve the puzzle is the Answer to the Ultimate Question of Life, the Universe, and Everything (#42). 

Solution:

https://www.youtube.com/watch?v=-kv2sTiPHsM 

Original:

https://www.mrpuzzle.com.au/first-cylinder-take-apart-progressive-move-puzzle.html

I modeled these files, and initially published them on MyMiniFactory.

This object does not require supports. I do recommend using 4+ shells so it builds from the inside out and helps with the minor overhangs (Cura does this by default).

Layer height: .1-.2

Infill: 15-20%

Speed: Fairly slow for outer cylinder lines (~30ms)