MMU filament holder

I don't like original MMU filament holders for a number of reasons: 

• they can't be attached so they wonder around when placing filament;
• they have adjustable “rollers” which i absolutely HATE. I have different brands of filaments, and since they have different width i'd have to adjust them constantly;
• they are to wide for my filaments, so they occupy too much space.
   

Since i used a wonderful design from @Carrier (thanks!!!) on my (single-color) MK4S with great success i decided to remix that one.
I remixed one holder to have bearing pins on both sides for holders “in-between”. That way i saved about 4cm of total width. I also shortened roller width by 1cm and again i saved 5cm of width (yep, space is my problem…). This way filament rolls can be up to around 7cm wide. I added small “squares” on each holder for fixing it to a shelf with screws.

I also added PTFE holders and filament numbers on front “support” parts for easier identification. PTFE tube is fed vertically as i plan to put holder on a shelf, also inserting filament vertically allows a simple use of “bowden speed loader” -  a wonderful thing from MrFlippant.

If you have wider filament rolls you can print original rollers from @Carrier's page. Just be warned that in this case you must also print original “support” parts; also my custom “support” parts with numbers will be too short (but you could widen them inside slicer - ok, numbers will be a bit “fat” in this case, but it's not a big deal…). 

I printed all parts with 0.2mm layer height with 15% infill. 

• “holder dual” are printed standing “as is” with supports from build plate only (for supporting bearing pins).  Perhaps only small correction of round bearing pins will be needed - use a file or a grinding paper.
• left and right holders can be printed lying down on their side. 
• print rollers standing 
• print front "support" parts with numbers lying on the bed - this way only first two layers will require filament change (when using 0.2mm layer height). They are printed with MMU, if you don't have MMU (yet) there are other options:
  • manually change filaments (numbers are only 0.4mm deep, so if you set layer height to 0.2mm you only need to change filament three times);
  • print only “support one, support two…" parts without actual numbers - that way numbers will be a bit indented in support, but still readable; 
  • change filament in third layer
  • you can omit them and only install classic supports

You have to print:

• 1 left holder
• 1 right holder
• 4 middle (dual) holders
• 10 rollers
• 10 supports - these aren't strictly mandatory: if you plan to screw holder on the shelf you can omit them. But, if you plan to have your holder freestanding they should be there - note that they should be mounted at the front, too, since “supports” with numbers can't be screwed (only first at the left and last at the right); but in any way they are good for stiffness.
• 12 "side cover screw" parts
• 5 front supports - one of each number - together with numbers (in multicolor mode, of course)
• you need 608 bearings - a total of 20 pcs (real or printed ones) and some M3x15-20 screws

I guess that anyone who will print this has MMU unit, so it won't be a problem to print front supports with numbers in multicolor. 

UPDATE 29.7.2025:  I figured it out that i need some kind of information which type of filament i have loaded, so i added tab holders on front “supports”. Print them as they are uploaded with number lying down on plate. 

First version of these “supports” are still here, though.

Tabs are double-sided: PLA on one side and PET on other. I didn't write “PETG” since font would be smaller in this case, so it wouldn't be nice…

UPDATE 2.8.2025: tabs are now a bit more upright, since filament was in the way when inserting filament type tag. Also tags are now easier to insert.

UPDATE 10.8.2025: added “supports” (PTFE holders) for horizontal placing. In this case filament is fed from bottom of the spool (like original), but it's possible to place whole holder to the table.

UPDATE 20.8.2025: added front “support” without number holder, just with hole for PTFE tube.

A bit shortened roller, added dual holder between rolls,  added tags and fixations