Prusament/Masterspool adapter

Reuse Prusament spools for Master Spool compatible filament refills.
9h 7m
2× print file
0.15 mm
0.40 mm
196.00 g
9
36
0
587
updated March 30, 2023

Description

PDF

Love Prusament? Got a bunch of empty Prusament spools gathering dust because you feel bad about throwing them away? Then this print is for you!

Upcycle your empty Prusament spools into MasterSpool compatible spools that can accept filament refill. No longer do you need to feel bad about the waste caused by spools!

Changes in V2 (2023-03-30):

  • Simpler and smaller geometry, needs less filament to print.
  • Filament stub trap removed, it make the press fit too weak. Please use the holes in the Prusament spool sides to catch the end stub.

Materials (one spool):

  • You need one empty Prusament Spool for the assembly.
  • I recommend PETG for the printed parts. PLA might work but I haven't tested it.
  • You need to print one of both the (F) and (M) parts.

CAUTION: The model relies on a strong press-fit onto the Prusament spool, you may want to test print a 1 cm tall section of the outer ridge of the (F) part to check that the fit will be good before printing all the parts.

Assembly Instructions:

  1. Gently but firmly pull the sides of the Prusament spool of the cardboard tube by gripping in the central hole of the spool. It takes a bit of firm convincing and wiggling but they'll eventually come of. They're just pressed onto the cardboard tube, there's no glue.
  2. Take one of the spool sides, and lay it flat on a table with the ridge that was previously inside of the cardboard tube facing up.
  3. Take the (M) part and align the outer groove with the ridge on the spool, make sure that the teeth on the inside of the groove mesh with the teeth on the ridge. 
  4. Slowly but firmly, press the (M) part onto the spool side until seated all the way. Use both hands if necessary. The fit should be tight and very hard, if not impossible to separate. If the fit is loose, you might need to tune your print settings, or resort to gluing.
  5. Repeat steps 2-4 for the other side and the (F) part. 
  6. Load your filament refill like any other MasterSpool, check that the filament unwinds in the right direction so that you can use the integrated filament clips in the side, and screw the halves togther.
  7. Enjoy your refill spool.

Printing Instructions (Easy Mode):

I recommend using the .3mf files that have the print settings tuned for a strong and fast print. Just open in Prusa Slicer, adjust material/printer profile and slice!

Printing Instructions (Hard Mode):

So you want to set up the print yourself? I don't blame you. In that case you should be aware that there's a fair amound of mechanical advantage causing high stress in some areas when gripping the spool on the outside rim and twisting the halves close.

 

In the picture to the left you'll see a cross-section of both the (F) and the (M) part when screwed together. The area marked in blue should be solid material as it will transfer all the rotational forces from opening and closing the spool. The outside most rings hold all the radial forces from the pressfit onto the spool, and must definitely be solid.

The upper yellow area is only decorative and can have sparse infill and few perimeters as long as the blue area is solid.

The threaded sections should have 3 perimeters and should be printed with 0.15 mm layer height. Thicker layer heights, especially when using PETG will make the threads not come out cleanly and may make it hard to open and close the spool. On other parts of the spool, the layer height doesn't matter.

I recommend ironing the mating surface of the (M) half, and printing the (F) half with  the mating surface towards the print bed to make them close tightly and not risk anything getting stuck.

 

This model is different from: https://www.printables.com/model/431304-simple-prusament-to-masterspool-adapter in it is a threaded design that is easier to open and close for loading the refill spool.

This model is different from https://www.printables.com/model/413374-prusament-spool-adapter-for-reusable-spool in that no additional hardware is needed and there's no risk of the spool coming apart if the magnets aren't strong enough.

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