The idea of this puzzle is not new. Often they are industrially produced designs. Originally I had planned to make it from copper wire. However, I found out that it is almost impossible to bend a spiral with even spacing, not to mention bending it evenly round. Also, the wire, when viewed over its entire length, is too thin and would bend very easily. So I decided to design and print all parts.

There are different versions in the world, but this one is certainly unique!

Printed quickly ... also a nice little gift for friends!

You can make the spiral with one, two or three colors. Of course, the easiest way is to print in one color.

For those who work with the "Prusa Slicer" and know a little: in the "Prusa Slicer" there is the possibility to set an x in different heights. When you click on the position, a "+" appears first. After clicking on the "+" it becomes an "x". The printer stops when it has processed the height. You can then change the filament … just follow the instructions on the screen. Works very well! 

The height of the spiral is 4.8mm. To make sure the the color segments (3) get an even height, an x can be set every 1.6mm in the slicer (1.6 - 3.2).

Only when all x's are set, click on "Slice now".

The ring has a 0.15 mm opening, which makes it possible to integrate the ring into the spiral. After that, the opening should be closed with a little super glue.

Print settings:

• printer brand: Prusa
• printer: Mk3s
• supports: No
• resolution: 0,2
• infill: 10%
• filament brand: Prusa; ICE
• filament color: Galaxy Black; Wintershine White, Romantic Red
• filament material: PLA

Remark: As all parts are designed to fit very precisely, it may happen that you have to rework one or the other part a bit with sandpaper and/or cutter due to different dimensional accuracy of the printers and the different behavior of the filaments.
 

How to insert the rectangle:

To show how a puzzle is solved is a no-go for all puzzle freaks. But to solve a puzzle, it must first be made sharp. Here are a few pictures of how the rectangle is inserted: