#1 Gearbox grinding went away after lubrication (some parts of the video were reused)
#2 Motor never stalled anymore. Possibly due to better wiring.
#3 Nozzle was drilled to 1.9mm to produce 1.75mm PLA. 1.6mm for ABS, exactly like it was with filastruder.
#4 Recycled plastic extrudes ONLY in horizontal position.