Makerbot Z18 Top Mounted Spool Holder

As with all Makerbots this has the dumb old fashioned filament tube that causes 90% of filament jams, so I made this top mounted spool mount that does not require the tube and feeds the filament directly to the extruder but as I hate spending 20 hours printing a silly spool mount for my printer so I made this, it prints in less than 4 hours but requires 6mm & 8mm Round tubes (carbon,Brass or Aluminum) thus reducing the print time by less than 1/6 th . Almost no friction and no ball bearings requ