This is an extruder block designed for the MakerGear Plastruder that allows for quick change of filament and easy clean up after a filament strip.May 6, 2012 Updated the idler block design.Print the 175 or the 300 build plate depend on your filament size. The fit of the components are pretty tight, depending on the calibration of your printer, you may need to do some sanding to put the idler and the top-hinge in.If you are using a makergear plastruder, the only extra vitamins you will need are one 25mm M3 screw, one 30mm M3 screw and 2 M3 nutsconfiguration.scad is also required. Get it form https://github.com/prusajr/PrusaMendel if you don't already have it.