I had one of these Adafruit Circuit Playground electronic component plushies laying around just waiting to be hacked. So, thinking along the lines of the Resistor Value Helper Tie, having a resistor value decoder laying around would be pretty handy. Also fun to use and get kids interested in electronics.
This is a simple task to create a set of stacked freely rotatable rings like a cryptex, affix the color coded bands, and mount them on the plushie.
Relax. meditate, do not fear divining the value of any unknown resistor, oooooooooooooooooooooooooooooohm...
Step 1: Just a few parts...
A piece of plastic pipe 1 1/2 inch diameter to cut into rings for the color bands. I just got a kitchen sink tailpiece stub to use since it was cheap and I didn't need a whole long pipe to do any plumbing. The 1 1/4 inch diameter pipe for bathroom plumbing may be too tight so don't get that.
There are many ways to cut plastic pipe. If you don't have a power saw, a hand saw will work. Even better if you have a tubing cutter for plastic pipe. If you are really desperate, a cotton string held tautly and sawed across the pipe will friction cut it.
Just be sure to clamp the pipe securely in a vise or something and block around it in a block of wood with a V channel cut in it so the round shape does not slip.
I think you can also attempt this project with metal or even cardboard tubing(paper towel/toilet paper rolls, electrical tape cores) if desired. I chose plastic since it would be more rigid and would not really wear out the fabric of the plushie.
Have a small file or some sandpaper to deburr the cut edges of the plastic. No need to use solvents or solvent vapor like in smoothing out a freshly minted 3D print.
You will need sticker address label paper to print out the graphic for the color bands. You can also use double-sided tape or a good glue to stick the printed graphic on regular paper to the plastic tube.
Click on the graphic color chart image until you get to the original size file download area and download the image.