Love hurts and I love the new UM2+ feeder. But I decided that my poor finger shall not pain no more and quickly designed this little wedge. It is to be inserted below the lever that releases the pressure on the filament. Print with two shells and 100% infill (very quick print).

Btw. please note the expertly designed hole on the bottom where a small, round 3x3mm neodym magnet can be inserted so the wedge snaps to metallic parts on the printer. The magnet should go all the way in but I printed the wedge with 3 shells and the hole is too tight... oh well. :)