Filament assist drives make printing very-tacky, flexible filaments possible by counteracting any friction in the guide tube. As a bonus, they make loading filament easier.
- Unload filament and slide the PTFE out of the filament cabinet
- Using 2x M6x8 screws, attach the mounting bracket to 2x T-nuts and slide the assembly into the extrusion. (If you are installing the assist between two existing positions, you can insert the T-nuts into the channel from the front, then mount the bracket to them)
- Slide the drive unit until the extruder is aligned with the filament cabinet outlet and tighten the M6 screws
- Insert the PTFE guide tube into the bottom of the drive unit, making sure the "V" of the PTFE is aligned between the drive roller and idler
- Insert the upper PTFE guide through the filament cabinet outlet and into the top of the drive extruder, again ensuring PTFE rotation is correct with respect to the drive roller and idler
- The first filament assist drive you install requires the Filament Assist PCB. Subsequent drives do not require an additional PCB. The FA PCB should be mounted to the upper position on the front plate of the cabinet with 4x M3x6 screws.
- Two cables must be attached:
- A 4-wire cable from MOT IN on the FA PCB to E9 on the Duex5 PCB
- A 5-wire cable from SELECT on the FA PCB to a cable labelled "Efasw" (not on a PCB)
IMAGES of cables
- Connect one end of the cable to the correct position on the Filament Assist PCB mounted to the front wall of the Electronics Cabinet. The positions are labelled 1, 2, 3, 4, and 5 to correspond with those tool numbers. The filament spools are ordered 1-5 from front to back. If you are adding a filament assist to Tool 2, you will connect the cable to position "2" on the filament assist PCB, and route the cable back to the second bay from the front in the filament rack/cabinet.
- Route the cable through the feedthru hole between cabinets, underneath the trunnion supports, and through the external cabinet feedthru nearest the drive that you already installed. Plug the cable into the drive motor.
The filament assist positions are already configured in the firmware. They are designed to overdrive the filament (by 10% more than the extruder position), but the current is set low enough that the motors easily stall when the filament cannot be pushed further into the guide tube.