PP3DP UP Plus 2 PLA printing kit

PP3DP UP Plus and UP Plus 2 are usually terrible with printing PLA. Three major issues with these printers are The throat of the hotend gets too hot as heat creep up the steel tube and the PLA starts to bulge there and gets impossible to reliably extrude Extruder stepper motor gets hot during print, both from the fact that it's a puny motor doing a lot of work and because it's used partially as a cooler for the cold part of the hot end. This heats up the PLA print and does not allow it to solidify properly, overhangs are crap and bridges are almost impossible. PLA requires cooling, the "solution" originally is that hotend cooling duct has a "door" that let some of the air go into to part. The "solution" does not work. To solve these problems I started by redesigning the extruder cooling. This solves both the issue of bulging inside the hotend and the problem with extruder getting too much heat from the hotend. This solves all the print issues with ABS, P