Print 2 discs and 2 balls. Assemble with some cord (I used a 7-string paracord) as shown in the image. The puzzle is to remove the ring! No force is required. 

Classic Ring Puzzle

All parts printed in the given orientation, in your choice of material and infill. No supports required. 

Body.stl

A giant 20-sided die! Perfect for a Dungeon Master who needs to show some player characters who is boss!

Overhang angle is around 40 degrees. Support may or may not be necessary, depending on your printer! Support angle of 60 degrees is recommended for the inset numbers to have the best results. 

Print with equal number of walls and top/bottom layers for consistency. I use 3, and 22% infill, for a mass of 119 g. 

D20 Polyhedral Dice 80mm

A small dice tray to hold (in the lid) and roll (in the base) two sets of standard polyhedral dice. 
Use small (4mm diameter) magnets to hold the lid to the base. 

Dice tray

dicetray_bot.stl

Fits on a keychain, and clips to a standard size flying disc.
Print with 5 walls and 0.1 horizontal expansion. 

Flying disc clip

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Classic Ring Puzzle

D20 Polyhedral Dice 80mm

Dice tray

Flying disc clip