Prusament Spool to Das Filament 800g Refill Adapter

This adapter enables you to use your old Prusament spools as a MasterSpool for 800g filament refills from Das Filament. The Refill sits tighter in the adapter than in the original MasterSpool.

It is a sturdy and long lasting alternative to fully printed spools. To improve the reliability in systems like the BambuLab AMS, the end of the filament is secured by the original Prusament spool half fixtures. This prevents the filament refill from rotating on the spool, which is a common issue with refills in the AMS.

For printers with filament runout detection, it's best not to attach the end of the filament. The extruder will probably not be able to pull the filament out of the hole.

Installation Guide

This applies to the version with the short screws and inserted nuts. The pictures show the assembly process in the right order.

1. Remove the cardboard center of the Prusa Spool. The cardboard can be tight, but you should get it out by wiggling the spool halves. Don't use excessive force, otherwise you might break the spool halves.

2. Prepare the Center Piece: Press in the M4 nuts. Not all nuts are made equal, some are a bit smaller than 3mm height and some a bit taller. Therefore the installation can be challenging.

3. Screw on the bottom piece of the spool halves. You can use either one of the halves.

4. If necessary, rotate the zip ties of the Refill to the outside before putting it onto the center piece.

5. Find the beginning of the filament on the inside of the Refill. This side has to face up. Pull out the end of the filament one third (towards the next zip tie).

6. Put the refill onto the center piece. The center piece is intentionally tight to avoid rotation of the filament on the spool. Make sure to align the end of end of the filament towards the filament throughhole.

7. Insert the filament end into the upper Prusament half (see picture of the marking).

8. (Optionally) Cut the end of the filament that is sticking out of the spool half.

9. Align the top half of the spool and tighten the screws lightly (not all the way yet!). Try to make sure the filament did not jump out of it's groove.

10. Attach the outer end of the filament string to the filament spool, so it won't unwind itself.

11. Cut the zip ties and pull the first one out, then tighten the adjacent screw(s). Proceed the same way with the rest of the zip ties.

12. Make sure all screws are tight.

13. Apply the sticker to the spool.

14. DONE! 🥳

Additional Hardware

Short Screws and Nuts

• 8x M4x16mm (or longer, up to ~20mm should be fine) Screws, DIN 9784 or DIN 84 for flush outer spool surface, otherwise DIN 912 works too

• 8x M4 Nuts

Alternative: Long Screws

It is possible to use four very long screws instead of the eight short screws and inserted nuts and make use of the fact that the hexagons of the Prusa spool are 7mm wide, leaving the perfect room for an M4 nut. This is not recommended though as it is more finnicky to assemble the spool.

• 4x M4x55mm Screws, preferrably DIN 9784 Cylinder Screws (if you can find them that long) or DIN 84 Slotted Screw. DIN 912 works as well, but the head will protrude the spool. If that does not bother you, these are the easiest to find

• 4x M4 nuts

Print Settings

• Use a temperature resistant filament like ABS, ASA, PC(CF), … if you want to put the spool into a filament dryer.

• It is recommended not to use a hydrophilic material such as PLA, PETG, PA, … if you want to dry your filament, because you'll have to dry filament AND spool center.

• With three outer perimeters, the important parts of the perimeter is completely filled. The actual infill in the center part is not incredibly relevant for the strength.

• No supports are required.

• Optimized for 0.25mm layer height.

Please consider liking and posting a make if you find this useful 🙂