Longer Prusa Spool holder (MMU compatible) with printable bearings

From the first time I got my MMU, I didn't like the margarita style spool holders for the buffer, because it requires space that I do not have. I came up with this solution. It can accomodate up to 4 spools on top of Prusa MK3. I only use 3, because I seldom need more and I also have my tool holder which requires some space. I have rotated the buffer 90 degrees and placed it next to the printer, as seen in the pictures. This way you can accomadate one more spool roll in the back of the printer.

Pros of this spool holders:

1. Very easy to feed the MMU - change spools, etc
2. Requires very little space.
3. More classic look.
4. The bearings create a smooth rolling.
5. Can also be used in the classic version without the MMU.

Regarding the construction, all parts are made of PETG, except the bearings and fillament guides that are made from PLA for a bit of extra strength.

After you finish the printing of bearings you need to work with them with your hands for a couple of minutes to remove small stuck points from stringing… If you do this in a few minutes the bearing will be rolling ok.

I include (3mf) slicer files for prusa MK3S+ and Creality K1max.

Since I am a new owner of MMU, I have only done a few hours of printing, with a few dozen fillament changes, but until now this system appears to be working nicely. If you ever try it, let me know how it goes…

List of screws needed:

3x M3 DIN934 hexagon nuts

2x M6 DIN934 hexagon nuts

2x M3x10 DIN912 alen screws

1x M3x20 DIN912 alen screw

1x M6x40 DIN912 alen screw

1x M6x40 DIN7380 alen screw