RMU-Mk3 Model Variations
The RMU-Mk3 filament buffer comes in two model variations. The Mod-S and Mod-T.
The Mod-S is our original filament buffer designed exclusively for the Prusa i3 Mk3 printer with the Prusa MMU2 fitted.
The design of the Mod-S was to allow for left side or under desk loading of filament from the spool.
The Mod-T variant was designed to allow for easy top feeding. Our studies have shown that top feeding is more popular and the Mod-T is specifically designed to give simple yet reliable top feeding and management of the filament.
When you buy the RMU-Mk3 Filament Buffer STL files to print yourself, you will get the plans to print either model so you choose which one to use.
RMU-Mk3 Filament Buffer Mod-T
The RMU-MK3 Mod-T shown here is designed to feed from above.
In the image above you can see the complete kit of parts that make the BF001 in the Mod-T variant.
The right side pass through adaptors feed filament into the buffer while the left side feed out the Prusa MMU.
RMU-Mk3 Filament Buffer Mod-S
The RMU-MK3 Mod-S shown here is designed to feed from the left or below.
In the image above you can see the complete kit of parts that make the BF001 in the Mod-S variant.
Note the layout of the pass through adaptors. The lower adaptors allow easy feeding from desk mounted or under desk spools of filament.
Wow! That looks really good!
Are there any mechanical drawings of this “filament Retraction Unit”? Thanks Marco
Hi Marco, Do you mean the design files?
This is by far the best filament buffer unit design for the MMU2S! This has completely eliminated the slack filament/entangled filament issues I was having with the Prusa version and other designs. The STLs were easy to print and the video assembly instructions were clear and easy to follow. A great addition to the MMU2S, to make the printing process that much smoother!
This was a needed addition to my MMU2S to reduce the friction and get all 5 filaments working. The other changes were in the printer settings for cooling moves and unloading speeds in PrusaSlicer to ensure there where no jams in the tubing due to large ends/tips on the filament on retraction.
Unloading speed 120
Number of cooling moves 3
ramming parameters 3.5
This may not be the perfect settings yet but on a model I went from 5 failed prints to only 3 interventions with the MMU on an 15 hour print with 5 filaments.