Filament Calibration Jig for Prusa i3 Mk3

This is yet another filament calibration jig, this time for the genuine Prusa i3 Mk3. The bottom piece slides over and squeezes onto the small filament guide at the top of the extruder assembly (see photo).

This jig turned out to be irrelevant, as my test results showed that Prusa has the extruder tuned bang-on from the factory, but I figured I'd share.