ABCDEFGHIJKLMNOPQRSTUVWXYZAAABAC
1
m3x
2
!!! Draft - work in progress !!!
3
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. (eg. 3x BHCS and 2x FHCS screws)
4
Latest Update: 17 Oct 2025
5
Number of lanes4
6
ComponentsQuantitySourcing link (secondary sourcing links in the EMU Lanes and Base BOM sheet)Notes
Sourced quantity
7
Bearings688 bearing5https://www.aliexpress.com/item/1005008537901204.html20
8
693ZZ bearing (8 mm OD, 3 mm ID, 4 mm width)1https://www.aliexpress.com/item/1005008537901204.html4
9
HF081412 One-Way Bearing1https://www.aliexpress.com/item/1005007774517464.html4
10
MR85 bearing1https://www.aliexpress.com/item/1005006175643534.html4
11
Electronics, cabling & connectors18 AWG multi-strand silicone wiring (Red and Black) for power distribution00
12
24v 3010 axial fan1https://www.aliexpress.com/item/32406690267.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
13
28 or 24 awg soft silicone wire (multiple colors - black, red, white, yellow, blue, green recommended). A wiring spool multi-pack is recommended5https://www.aliexpress.com/item/1005009382878454.html20
14
BME280 5V temperature and humidity sensor1https://www.aliexpress.com/item/1005005333471595.html4
15
CAN Bus cable1https://www.aliexpress.com/item/1005005878119372.html** one per base unit in total. Not one per lane4
16
D2F-L Lever Microswitch4https://www.aliexpress.com/item/1005006838529564.html16
17
Dupont 2.54mm female connectors 1 pin housing1https://www.aliexpress.com/item/1005009002379344.html4
18
Dupont 2.54mm female connectors 4 pin housing1https://www.aliexpress.com/item/1005009002379344.html4
19
Dupont 2.54mm female connectors 5 pin housing1https://www.aliexpress.com/item/1005009002379344.html4
20
Dupont female connector3https://www.aliexpress.com/item/1005009002379344.html12
21
EBB42 (preferred) EBB36 (alternative) with included hardware1https://www.aliexpress.com/item/1005007513421820.html4
22
JST XH 3 pin plug (male and female pair)1https://www.aliexpress.com/item/1005003393004154.html4
23
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
24
JST XH 8 pin plug (male and female pair)1https://www.aliexpress.com/item/1005003393004154.html4
25
Multi-color heatshrink (for wire labelling)1https://www.aliexpress.com/item/1005007299988420.html4
26
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
27
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
28
Pre terminated 30cm JST XH cables (optional - convenience item - board to box pigtails) 24AWG/28AWG0
https://www.aliexpress.com/item/1005002160765607.html		0
29
WAGO 221-4133https://www.aliexpress.com/item/1005008705372684.html12
30
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
31
FastenersM2x8mm SHCS/BHCS or M2x10 self taping screws6https://www.aliexpress.com/item/1005003619368620.html24
32
M3 Square Nut (DIN 562)5https://www.aliexpress.com/item/1005008619340148.html20
33
M3 washer2https://www.aliexpress.com/item/1005007625630719.html8
34
M3x12mm FHCS5https://www.aliexpress.com/item/1005008514092847.html20
35
M3x12mm SHCS8https://www.aliexpress.com/item/1005006453614010.html32
36
M3x16mm BHCS2https://www.aliexpress.com/item/1005008525637016.html8
37
M3x20mm BHCS3https://www.aliexpress.com/item/1005008525637016.html12
38
M3x30mm SHCS2https://www.aliexpress.com/item/1005006453614010.html8
39
M3x40mm FHCS6https://www.aliexpress.com/item/32968616563.html24
40
M3x4x5 heatset insert19https://www.aliexpress.com/item/1005006316825236.html76
41
M3x6mm BHCS2https://www.aliexpress.com/item/1005008525637016.html8
42
M3x6mm FHCS3https://www.aliexpress.com/item/1005008514092847.html12
43
M3x8mm BHCS7https://www.aliexpress.com/item/1005008525637016.html28
44
M3x8mm FHCS24https://www.aliexpress.com/item/1005008514092847.html96
45
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
46
20mm M3 brass spacer1https://www.aliexpress.com/item/32898939430.html** if using an EBB36, they are already included in the board packaging.4
47
3mm foam tape (5-6mm wide)0.3https://www.aliexpress.com/item/1005004040159416.html1.2
48
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
49
8mm (OD) x 70mm (L) Dowel Pins1https://www.aliexpress.com/item/4000473863693.html4
50
BMG hobbed gear with grub screw1https://www.aliexpress.com/item/1005007720655144.html4
51
ECAS043https://www.aliexpress.com/item/1005007556480356.html12
52
Foam Cord 3mm thick (meters)1.5https://www.aliexpress.com/item/1005005853458948.html6
53
O-ring - 20mm ID, 27mm OD, 3.5mm cross section (cs). Shore 90A or harder, NBR (Buna-N). Alternatively print from TPU2https://www.aliexpress.com/item/1005008084024978.html8
54
PETG / PC panel 343x84mm, 1.5mm thick1See EMU Lanes and Base BOM for regional sourcing options4
55
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
56
Spring - 304 Stainless Steel,6mm OD,0.6mm Wire Size,7.5mm Compressed Length,15mm Free Length1https://www.aliexpress.com/item/1005005312507393.html4
57
Spring 6mm outer diameter, 0.8mm Wire Size, 10mm Free Length1https://www.aliexpress.com/item/1005005312667010.html
58
59
60
61
62
63
64
Notes
65
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).
66
#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)
67
CAN Bus cable** one per base unit in total. Not one per lane
68
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.
69
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)
70
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
71
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
72
M3x15 pin** only needed if using the bushing stepper tensioning arm
73
20mm M3 brass spacer** if using an EBB36, they are already included in the board packaging.
74
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.
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100