Simple billiard chalk holder with cap.
Inner size 23.2 x 23.2 mm. Fits common rectangular chalk blocks.

Has a hole in the cap to push out the holder with your cue tip. It also has a smaller hole in the base piece to push out the chalk block for replacing.

Prints easily with Prusa i3 MK2S with .35 layer height in PLA, default Slic3r settings.

Attached two STL files. Both have identical designs. But one has the two components positioned ready for printing.

Picture shows a customized version with the owners first name on it. The attached STL files are without the name.

Prusa

i3 MK2S

No

No

.35

20%, but 100% will work also