- SB_CS2_Main_Body_EBB_ECAS_D2F "CW2 main body for the ERCF w/ ECAs, bearing switch, and SB2209 Canbus mods" Thanks to [juliusjj25](https://github.com/juliusjj25)
I was looking at the ERCF MMU for several month now. What always kept me from starting the project were the discussions about issues and problems with filament tip forming. Suddenly a new company showed us how they do it quite reliable. They just cut the filament. Further motivated and inspired by the design of @pure100kim who has built the [ERCF_Filament_Cutting_MOD](https://github.com/pure100kim/ERCF_Filament_Cutting_MOD) I started to build my own version of it.
### Parts list - considering you already have a Stealthburner with Dragon Hotend
#### Toolhead:
- Loctite
- 1x M3 nut (DIN934; ideally a countersunk tool to modify the nut for proper filament insertion)
- 2x M3 washer (0.5mm)
- 1x M3x18 SHCS (it repleaces the top left M3x25 SHCS from the SB-Cover mount)
- 2x Voron heat inserts
- 1x M3x18 FHCS (counter sunk screw)
- 1x M3x8 SHCS
- 1x M2.5x16 SHCS (15-18mm works)
- Spring of ballpoint pen (L=15mm; D<=4,5mm) (I've ordered some for testing, to have a "defined" spring)
- Typ 4 Sharp Metall Skalpel (we will cut it to length) [Link](https://de.aliexpress.com/item/1005005117830095.html?spm=a2g0o.order_detail.order_detail_item.9.47c26368QwSbBr&gatewayAdapt=glo2deu)
Insert the skalpel (which is cut to 26mm) into the knife holder until you see it in the little hole. Use pliers to push it into the knife holder. Some force should be needed as the skalpel should stay in place due to the "pressfit". If that's not the case add some glue.(Depelding on skalpel tolerances)
The M2.5x15 screw is directly screwed into the plastic of the knife holder. The tip of the screw should be flush with the cutting arm or no more than 0.1-0.3mm above it.
Check the orientation of the hole for the M2.5 screw in the knife holder. It needs to be on the bottom side.
**!! The knife holder must move up and down without friction in the cutting arm but shoult not have a lot play. Maybe some grinding is needed. !!**
#### Finished cutting point assembly should look like this
Note: for titanium backers, the backer should be centered between belt clamps and the end of the depressor mount should be flush with the end of the backer. This will work for all backers with 10/20/40mm spacing with the furthest back hole 5-15mm from the end. Height of depressor should be adjusted to press in the depression on the cutting arm and the BHCS can be adjusted in and out for the right positioning and locked in place with the M3 nut.
Copy mmu_additional.cfg to your printer config directory mmu/base/ and include it in your printer.cfg below all of the mmu includes via [include mmu/base/mmu_additional.cfg]
You will need to adjust the parameters in mmu_addtional as well, like setting up your cutter location, speeds, etc. More information in the cfg file itself.
