Compressor wheel extruder indicator

thingiverse

This model is a slightly modified version of Blecheimer's Compressor Wheel. It has been scaled down to about 34mm OD and features a thicker base with a 5mm-deep hole in the center shaped to fit snugly on a NEMA17 output shaft. The design ensures a tight fit, so you may need to open it up slightly using fine-grit sandpaper or a deburring tool. This indicator was designed specifically for Creality Ender-3 stock extruders without compromising access to the idler-lever. Although feeding new filament through the extruder blind is more challenging, getting the fit right makes it easy to pop the indicator on and off as needed. It's also recommended that you print the indicator in a different color from your printer to make it more visible. As seen in the photo, adding contrast helped increase visibility.