This is a bicolor Extruder Visualizer for the Bear Upgrade .

The inlay is only 2 layers thick to minimize Color changes , so it is possible to print it with manual color changes on single Extruder printers supporting M600 command :)

See https://www.thingiverse.com/thing:3278326 for a tutorial on how to do that

The only other hardware needed is an 8x3 mm Neodym Magnet which you glue to the back of the Visualizer using Super-Glue .

Then stick it on the Extruder Motor Axle and watch it turn forth and back as filament is extruded or retracted :)

Here's a video of the Visualizer in action ..... https://youtu.be/dtrZ-JVIvzo