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m3x
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!!! Draft - work in progress !!!
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Please note, due to the way the BOM is aggregated, you may have some (limited) left over screws due to the base unit being assembled in pairs. (3x BHCS and 2x FHCS screws)
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Latest Update: 5 September 2025
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Number of lanes
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ComponentsQuantitySourcing link (secondary sourcing links in the EMU Lanes and Base BOM sheet)Notes
Sourced quantity
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Bearings688 bearing5https://www.aliexpress.com/item/1005008537901204.html20
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HF081412 One-Way Bearing1https://www.aliexpress.com/item/1005007774517464.html4
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Electronics, cabling & connectors24 awg wire (multiple colors - black, red, white, yellow, blue, green recommended). Include appropriate heatshrink too. Approx 2 meters for white and 0.5-0.8 meter for the others.5https://www.aliexpress.com/item/1005009382878454.html20
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24v 3010 axial fan1https://www.aliexpress.com/item/1005002857100082.html** 5V fans also work, but fan V in would need to be connected to the Neopixel 5V header on the board. Depending on ambient temperature and unit location (eg on top of printer) less fans than 1 per lane may be sufficient. If in doubt, one fan per lane and PWM down to an acceptable noise level.4
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BME280 5V temperature and humidity sensor1https://www.aliexpress.com/item/1005005333471595.html4
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CAN Bus cable1https://www.aliexpress.com/item/1005005878119372.html** can also cut and open and use the wires for internal power and can cabling.4
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D2F-L Lever Microswitch4https://www.aliexpress.com/item/1005006838529564.html16
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Dupont 2.54mm female connectors 1 pin housing1https://www.aliexpress.com/item/1005009002379344.html4
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Dupont 2.54mm female connectors 4 pin housing1https://www.aliexpress.com/item/1005009002379344.html4
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Dupont 2.54mm female connectors 5 pin housing1https://www.aliexpress.com/item/1005009002379344.html4
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Dupont female connector3https://www.aliexpress.com/item/1005009002379344.html12
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EBB42 (preferred) EBB36 (alternative) with included hardware1https://www.aliexpress.com/item/1005007513421820.html4
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JST XH 3 pin plug (male and female pair)1https://www.aliexpress.com/item/1005003393004154.html4
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JST XH 4 pin plug (male and female pair)2https://www.aliexpress.com/item/1005003393004154.html** second JST XH needed only once per Base unit (connects the encoder and combiner sensor to the base unit)8
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JST XH 8 pin plug (male and female pair)1https://www.aliexpress.com/item/1005003393004154.html4
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Multi-color heatshrink (for wire labelling)1https://www.aliexpress.com/item/1005007299988420.html4
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Nema 17 42x42x23 stepper motor1https://www.omc-stepperonline.com/e-series-nema-17-bipolar-1-8deg-17ncm-24-07oz-in-1a-42x42x23mm-4-wires-17he08-1004s4
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Neopixel2https://www.aliexpress.com/item/1005002055597390.html** some neopixels have thicker PCBs. If your PCB is ~1.2mm thick use the standard eject button difuser. If it is ~2mm thick use the thicker PCB difuser. Both fit in the stepper LED holder part8
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Pre terminated JST XH cables (optional)0
https://www.aliexpress.com/item/1005002160765607.html		0
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WAGO 221-4134https://www.aliexpress.com/item/1005008705372684.html** 4 Wagos for first lane, 3 for subsequent ones.16
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XT30 2+2 plugs1https://www.aliexpress.com/item/1005006239028712.html** XT30 2+2 connector is per unit, not per lane. 3x needed, two for CAN IN and one for CAN Out if planning to daisy chain multiple units (eg. a 5 lane and 2 lane unit).4
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FastenersM2x8mm SHCS or M2x8 self taping screws6https://www.aliexpress.com/item/1005003619368620.html24
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M3 Square Nut (DIN 562)5https://www.aliexpress.com/item/1005008619340148.html20
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M3 washer2https://www.aliexpress.com/item/1005007625630719.html8
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M3x12mm FHCS5https://www.aliexpress.com/item/1005008514092847.html20
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M3x12mm SHCS7https://www.aliexpress.com/item/1005006453614010.html28
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M3x16mm BHCS2https://www.aliexpress.com/item/1005008525637016.html8
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M3x20mm BHCS3https://www.aliexpress.com/item/1005008525637016.html12
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M3x30mm SHCS2https://www.aliexpress.com/item/1005006453614010.html8
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M3x40mm FHCS6https://www.aliexpress.com/item/32968616563.html24
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M3x4x5 heatset insert19https://a.aliexpress.com/_EukzLYA76
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M3x6mm BHCS2https://www.aliexpress.com/item/1005008525637016.html8
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M3x6mm FHCS3https://www.aliexpress.com/item/1005008514092847.html12
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M3x8mm BHCS7https://www.aliexpress.com/item/1005008525637016.html28
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M3x8mm FHCS24https://www.aliexpress.com/item/1005008514092847.html96
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Misc Hardware#84 Rubber Band or mountain bike tire inner tube - 2.15 to 2.40 size.1https://www.aliexpress.com/item/1005003950451909.html** enough for approx 4 lanes (depending on tube diameter - see EMU Lanes and Base BOM for band size)4
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20mm M3 brass spacer1https://www.aliexpress.com/item/32898939430.html** if using an EBB36, they are already included in the board packaging.4
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3mm foam tape (5-6mm wide)0.3https://www.aliexpress.com/item/1005004040159416.html1.2
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6mm (OD) x 3mm (height) Disc Magnet7https://www.aliexpress.com/item/1005009684527822.html** use weak magnets or deactivate the magnets that are used to trigger filament path switches (filamentalist tensioner, pre-extruder, post-extruder, combiner/encoder using a small blowtorch/heatgun or lighter.28
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8mm (OD) x 70mm (L) Dowel Pins1https://www.aliexpress.com/item/4000473863693.html4
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BMG Gear Set1https://www.aliexpress.com/item/1005007720655144.html4
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Bushing (ID 5 x OD 8 x Length 7)1https://www.aliexpress.com/item/1005006001475644.html** alternative is 693ZZ 8mm OD, 3mm ID, 4mm height bearing and 1x M3x12mm BHCS4
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ECAS043https://www.aliexpress.com/item/1005007556480356.html12
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Foam Cord 3mm thick (meters)1https://www.aliexpress.com/item/1005005853458948.html4
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M3x15 pin1https://www.aliexpress.com/item/1005009385154332.html** only needed if using the bushing stepper tensioning arm4
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O-ring2https://www.aliexpress.com/item/4000139575437.html8
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PETG / PC panel 343x84mm, 1.5mm thick1See EMU Lanes and Base BOM for regional sourcing options4
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PTFE Tube 2.5mm ID, 4mm OD0.5https://www.aliexpress.com/item/1005003579739761.html** will depend on distance from dry box to combiner. Try to keep as short as possible with as little bends as possible to minimize friction2
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Spring - 304 Stainless Steel,6mm OD,0.6mm Wire Size,7.5mm Compressed Length,15mm Free Length1https://www.aliexpress.com/item/1005005312507393.html4
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Notes
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WAGO 221-413** 4 Wagos for first lane, 3 for subsequent ones.
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XT30 2+2 plugs
** XT30 2+2 connector is per unit, not per lane. 3x needed, two for CAN IN and one for CAN Out if planning to daisy chain multiple units (eg. a 5 lane and 2 lane unit).
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#84 Rubber Band or mountain bike tire inner tube - 2.15 to 2.40 size.
** enough for approx 4 lanes (depending on tube diameter - see EMU Lanes and Base BOM for band size)
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CAN Bus cable** can also cut and open and use the wires for internal power and can cabling.
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24v 3010 axial fan
** 5V fans also work, but fan V in would need to be connected to the Neopixel 5V header on the board. Depending on ambient temperature and unit location (eg on top of printer) less fans than 1 per lane may be sufficient. If in doubt, one fan per lane and PWM down to an acceptable noise level.
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JST XH 4 pin plug (male and female pair)
** second JST XH needed only once per Base unit (connects the encoder and combiner sensor to the base unit)
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Bushing (ID 5 x OD 8 x Length 7)
** alternative is 693ZZ 8mm OD, 3mm ID, 4mm height bearing and 1x M3x12mm BHCS
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PTFE Tube 2.5mm ID, 4mm OD
** will depend on distance from dry box to combiner. Try to keep as short as possible with as little bends as possible to minimize friction
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Neopixel
** some neopixels have thicker PCBs. If your PCB is ~1.2mm thick use the standard eject button difuser. If it is ~2mm thick use the thicker PCB difuser. Both fit in the stepper LED holder part
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M3x15 pin** only needed if using the bushing stepper tensioning arm
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20mm M3 brass spacer** if using an EBB36, they are already included in the board packaging.
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6mm (OD) x 3mm (height) Disc Magnet
** use weak magnets or deactivate the magnets that are used to trigger filament path switches (filamentalist tensioner, pre-extruder, post-extruder, combiner/encoder using a small blowtorch/heatgun or lighter.
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