This is an external spool holder designed to interface with the Flashforge Inventor 3D printer. It may also work with the Flashforge Dreamer and the Dremel Idea Builder. In order to complete this project, you will require a 5/8 inch round wood dowel of desired length and a piece of PFTE filament tube (3mm inner diameter, 4 mm outer diameter).
The external spool holder can hook and rest on either side of the 3D printer (left and/or right) and allow for the 3D printer lid to be closed even if only installed on one side.
I recommend enabling an 8mm skirt/brim around the external perimeter of the parts. I also recommend using between 4 and 6 perimeters/shells.
Step 1: New Enhancements Requested by a Friend
I was asked to remix my earlier design without the built-in bearings and this got me thinking. I could not just do that, I had to push the limits a bit further so I have embedded two filament guides into this remix and filled in the empty space between the spool holder brackets, the printer frame and the lid.
Step 2: Tweaks
After printing Parts A and B, I came to the realization that the connecting bits were too loose. I also observed that the filament guide holes needed to be relocated further apart. I reduced the clearances between the connecting bits and moved the filament guide hole closer to the center of each part.
When using brittle filaments, such as the Proto-Pasta Carbon Fiber HTPLA, do not feed the filament through the PFTE tubes/filament guides and do not close the lid. Otherwise, the filament will break as the carriage moves closer to the PFTE tubes/filament guides.