Redsalamander's Extruder

I started with a QUBD extruder and printed a few different upgrades for it. The extruder this is based on was reliable and I used it till about a year ago as a direct drive. On my newer printers I changed the design so that instead of a heatsink and fan mounted to a small cooling block on the motor, I made a large heatsink with fan that the barrel screwed into and the motor and mounted on top. I later changed this to a bowden design and this design can still be mounted as both a direct drive and