Why is there yet another Internal spool mod?
For one simple reason: This one doesn't require a panel spacer

And since the space inside is very limited it uses a latch to hold the spool from the inside, this was tested with elegoo cardboard spools. There also is a left-hand threaded section to be able to contain other spools that might not fit.

To release the filament spool, you need to press down on the button which will retract the latch.
For the assembly the only thing that is really important is to have 16mm screws for the red areas:

Materials

• 2 M3x8 FHCS

• 2 M3x16 BHCS or SHCS

• 4 M3x(8-16) BHCS or SHCS

• Some sort of lube 

Print settings

• Print as oriented

• 3 walls

• 0.2mm layer height

• 0.4mm line width

• Seam position: aligned

• Scarf seams: off

• Orient top and bottom walls to travel movement for less friction
  (my settings are:
  - Solid infill rotation template: 0,45,90,135
  - Align infill to model off)

• For best performance print out ASA. PETG works too but will need more lube. Avoid PLA and PA

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