Awesome extruder. With fune-tuning of the pressure screws I can print at 150mm/s now.
After printing, clear out the filament holes by scraping with a 1/16th drill bit. Be advised that if you get much mushrooming of your filament upon removal, you may need to take off the outlet push fitting and cut that bit off to remove filament successfully.
Also, I suggest using M3x30mm screws for mounting instead of the original 25mm. If your mounting bracket is bigger than 2mm there won't be much screw left over to mount into the stepper. Also depending on your stepper, you might not have much shaft left to insert into the smaller bearing (see photo) so you might just leave it out.