This is a bobbin for the Electric Eel Wheel Mini 2. This lets you print your own bobbins for this electric spinning wheel in any color you want. There is a Kickstarter for this project at: https://www.kickstarter.com/projects/dreamingrobots/electric-eel-wheel-mini-2

You need to print 1x eew_mini2_bobbin_tube and 2x eew_mini2_bobbin_disk per bobbin. The disk has a tight and loose option. If you have a well calibrated printer the tight one should make a snap together bobbin. If that doesn't fit well then you can use the loose option and glue the pieces together.