Sine Wave Desktop Crank Toy

This is a desktop sine wave visualizer fidget toy. As you rotate the crank, the sine wave propogates down the row of pegs in a nice, fluid motion.

Print the rods with a brim that's 2 layers wide and 2 layers thick. This will prevent them from slipping out of the case when turned upside-down.

Printing this requires a relatively well-tuned printer, as there are some pretty small components on the cams. For assembly, I used a 2mm aluminum rod as the center shaft. I suspect a length of filament may also work, but it will need to be gently heated and straightened before use.

I advise you print all of the parts, slide the cams onto the middle of the rod (with plenty of extra length on either side), and superglue the cams into place with the required spacer on one end. Then, you can fit them into the case and trim the rod down to length, checking the crank handle for fit.

For final assembly, turn the case upside-down, use tweasers to drop the rods into the holes, insert the cam assembly, pop the lid on, and attach the crank. I used an extra spacer on the rod opposite the crank to make the assembly look neat.

Note: This design can be a little tempurmental based on how each printer is tuned. You may need to check the cams for proper alignment with the holes in the case before you glue them in place. You may also need to slightly resize the rods if your printer extrudes a little more generously than mine.