Trapped Ring Puzzle
This is a classic disentanglement puzzle, often referred to as a "ring and string" or "loop and post" puzzle. The objective is to remove the metal ring from the puzzle without removing/cutting the band. I show you how to build your own from wood and have also included the 3D print files for those inclined to take that route.
Supplies
Materials:
- Wood Block
- 12" Long
- 1.5" Wide
- 1" thick
- Wood Pin (x2)
- 1/2" Diameter
- 3" Long
- Hairband
- Elastic
- 18" Long
- Metal Ring
- 1.5" Diameter
Tools:
- Measuring tape
- Pencil
- Saw
- Drill
- Forstner Bit (1/2" Diameter)
Assembly/Solution
This video shows the puzzle and solution. Don't watch it if you want to try to figure it out on your own.
Wood Base
Cut a rectangular wooden block (12 inches long, 1.5 to 2 inches wide, 1 inch thick). Sand all edges to remove splinters and smooth the surface.
Mark Hole Locations
Mark two spots on the top surface of the wooden base, 1.5 inches from each end.
Drill Holes
Use a drill bit that matches the diameter of your wooden dowels (1/2" for the version shown).
Drill holes about 3/4 inch deep into the wood.
Chamfer
I added a chamfer around the top surface. This step is purely decorative and is not required for the puzzle to be functional.
Cut Pins / Insert Into Holes
The dowels are 3" long. I rounded each top to allow the band to slide on more easily.
The dowel/bit combination required a press fit (rubber hammer) to insert into the hole. If the fit is loose, consider strengthening the joint with wood glue.
Ring
The ring can be made from wood, printed, or purchased. I purchased clip rings used for curtains. Remove the clip from the ring.
Band
The band needs to be elastic and 18" long. Headwraps work nicely. The puzzle shown uses the Scunci brand, but I found the Goody brand easier to maneuver with the puzzle.
3D Print
For the 3D print version, you will only need to print the base and ring. Files are included.
Final Pictures
I'm very happy with how these turned out. Hope you enjoy making your own. Please let me know if you have any questions. Also, if you like this puzzle, take a look at my instructables page for plenty of others.