Collection of Mods for COREBOXX Premium

Just a few new parts to modify the original COREBOXX Premium setup:

Wheel Sleeve: Looks and works better than the rubber band solution. To be printed in TPU with “Fuzzy Skin” in “Vase Mode”. 

Rewinder Mount: This mount provides more sturdiness and grip on the rewinder chassis to avoiding shaking from printer vibrations (which can be quite heavy). Please make sure you use the right screws for the chassis assembly (see picture). Further more the positions have been changed to avoid noisy contact with the frame on the outer mounts. The 3 middle ones moved 15 mm to the front which allows the placement of the MMU3 on the bottom behind them (see MMU3 Mount). They all fit into the already existing screw-holes on the bottom plate. However, you need to remove on both sides the second screw from the front in the bottom plate to the frame. 

MMU3 Mount: The mount uses the two middle screws holes in the back for the bottom plate to be installed avoiding drilling any new holes. You have to replace the screws with M3 15-16mm. Added an option for two extra screws, but they require new holes to be drilled into the bottom plate, but actually not really needed. The mount allows to clip in the MMU3 with the Original Prusa MMU3 brackles for the MK4. The brackles need to be assembled to the MMU3 in reverse (low side to the front side of the MMU3) without the cover. If you have the Ultimulti MMU3 you can use the mounting brackets designed by @Steve_524597. The MMU3 can be removed for maintenance very easy without any tools. It also allows shorter PTFE tubes to the rewinder and the Nextruder. Through the back maintenance door you have easy access to the front of the MMU3, if needed e.g. for filament change. Please keep in mind to connect the PTFE tubes in reverse order to the MMU3 to keep the spool order in front in the original order.

Hint: I suggest to remove the slits on the PTFE guide as seen on the picture (STEP file is included in the Original COREBOXX download in full model). The guide slides into its position without them also very well and avoids noise as well as friction, also in original setup with MMU3 mounted on the door. 

Both mounts print well in PETG without support in “0.25mm SPEED” mode with 4 Perimeter. However, for better print quality I recommend to use the normal mode with 0.2mm layer height.

Re-modelled Lever with 20mm wheel: This lever together with the 20mm wheel provides a much better and reliable grip for the rewinder without fine-tuning. Printed with top-side on build plate in PETG with 0.2 LH, 25% infill, 3 Perimeter, no support. 

If you still face problems with change/load/unload of filament with the Filamentalist V3 there might be a a lot of hacks tweaks for the slicer. I made a lot of investigations and tests before I gave up and went another solution. It's very likely that it's these are mechanical limitation of a passive rewinders, because of the increased tension and pressure on the Filament in the tube the Nextruder and printer firmware does not expect. 

In case you still suffer from filament change/load/unloading issues and want get to get back to reliable MMU prints with default profiles you can have a look here.

Nevertheless, still hope the one or the other mod could help the COREBOXX community.