Extruder for Printrbot Ubis hotend - Anti-clog -

WARNING: This is ONLY for Printrbot Ubis hotends! Will not work with any others unless the hotend has a 0.125" deep by 0.25 wide filament guide/funnel on the very top of your extruder!
Edited to fill in the funnel that is on the inlet of 1.75mm Printrbot Ubis hotends.

Edit: Corrected files a tiny bit.