Solidoodle MK6 requires 605 bearing and heavy spring, 625 bearing = OEM on SD. Prints fast.

thingiverse

Very fast filament changes, direct injection of filament (no gap to bind). Very reliable (200+ hours logged printing with 6kg of filament and a great performer easily hitting 100MM/s perimeter speeds with no problem, adaptable to other printers with minor mounting changes if desired. My MK6 (was mk5 lawsy uploaded before me with the name) filament block w/ fast mounting hole (the nubs from before tend to break off) (my main contribution is adding a mount to the filament block and tweaking the idler arm and block so that there is no gap for the filament to bind and a set screw to hold the nozzle in place (CMETZEL idea). Derived from MK2+ and MK4 (I was working to remove the mounting plate as Lawsy released his MK4, his was great so I moved from there); a few other's ideas or work that have been integrated Lawsy, Nophead, Tek, and more. (will edit to add where got the fan mount parts from) DI and Fan mounts are original work. lol. Instructions Same instructions from MK4 or before, but adding a spring for the idler arm and you need to reverse "E" direction in the firmware setting from false to true. so you won't be extruding in reverse or reflect with a CAD program to use with default settings.