Updated CW2 EBB SB2209 Fan Housing / Filament Sensors for ERCF / Filametrix / Dragon Ace

CW2 Main body for use with the BTT EBB SB2209/RP2040 canbus toolhead board. Dual filament sensors for use with the ERCF.

Updated 9/23/25

- New and improved EBB fan housing, way more room and improved air flow. - Fixed the tight limit switch pockets. - Tweaked the switch pocket distance, improves filament flow past the switch and assures the switch is activated only when filament is present. - Improved filament path and printibility - Added function for Filametrix Cutter (optional) - Filametrix; added the option for a MR63ZZ 3mmx6mmx2.5mm bearing to press down on the blade. (Probably unnecessary but it makes a cleaner cut) - Added an enhanced and improved fitting standard Filametrix Dragon Ace Stealthburner mount (using Filametrix cutter is optional - The fan cutout is a little bigger now and the cover now has spots in the rear for M3 heat inserts to either use M3 grub screws or button head screws to hold the fan in. I was finding myself breaking fans when removing because the fans frame was not accessible to push on.

Need:

QTY 2) 5.5mm ball bearing

QTY 4) M2 x 10 screws

QTY 2) micro limit switches (like the Omron D2F)

wire and connectors

Fan is a 24v 30x30x10

QTY 2) M3 heat inserts

QTY 2) M3x8 button head screw or M3 set screw to retain the fan

MMU Hardware config examples:

SB2209 with RP2040: If you're using a pt100/1000 you can use the open thermister pin on gpio27. And if you're not using a bltouch/tap or another sensor using the probe port you can use gpio22

extruder_switch_pin: ^EBBCan:gpio22

toolhead_switch_pin: ^EBBCan:gpio27

SB2209 with STM32G0B1: This board has more options with PB7 and PB5 already open for extra end-stops

extruder_switch_pin: ^EBBCan:PB7

toolhead_switch_pin: ^EBBCan:PB5