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

Activity related to collaborating with others on models

Likes, comments, and activity from your community

A roundup of models that we think you'll like

For when we think someone might have posted your content as their own

New content from your premium memberships

Emails and messages from designers you follow

fivesidedhex

Achievements

Seedling

Debutant

Classic Ring Puzzle

D20 Polyhedral Dice 80mm

Dice tray

Flying disc clip