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

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