Extra hardware required-
m5x35 - 1 for the hinge
m5 nut - 1 for the hinge
m3x12 BHCS - 2 to mount the hinge piece to the frame
Mount the hinge piece to the frame first, Then install the spool holder.
The m5 is totally overkill but i didn't have any long m4s on hand, you can modify the step for m4 hardware and it should be fine,
Mirror the spool holder of you want to mount it to the side of the machine instead of the the back. I got rid of the bottom ptfe grove to allow clearance for the rear fan.
The author remixed this model.