*Note：You will always need FOUR 6x2.5mm radial magnets, they are in fact included with the AS5600 chips in the BOM sheet of the PCB, so the author didn't list them in the mechanical sheet.
Some of the finished PCBs do not come with this magnet. They are VERY important and BMCU can't work without them. You must purchase RADIAL MAGNETS.
NO!!! 
YES!!!
Just in case there are times when some common components are not recorded in the BOM table, please know that you will always need the following parts or tools for a complete BMCU
| No. |
Name |
Quantity |
Note |
| COM_1 |
PH2.0 10pin cable 80mm |
4 |
Recommended 1*100mm+3*80mm |
| COM_2 |
MX3.0-4P Mirrored Cable |
1 |
|
| COM_3 |
Radial magnets 6*2.5mm |
4 |
You can also use smaller ones such as 5*2.5mm. |
| COM_4 |
Lubricating grease |
1 |
DO NOT use liquid oil-based lubricants. |
| COM_5 |
USB to TTL adapter |
1 |
Optional |
| COM_6 |
Transparent PETF filament or optic fibre |
40cm |
Optional, for guiding the led indicater |
¶ PCB - Mainboard
¶ Mainboard original version
Most BMCU currently use this PCB.
Click here to expend
| No. |
Name |
Package/Model |
Quantity |
| PCB-1 |
PH2.0 Connector |
PH2.0/10P (Horizontal SMT) |
8 |
| PCB-2 |
10kΩ Resistor Array |
0603×4 |
3 |
| PCB-3 |
100nF (50V) Capacitor |
C0603 |
28 |
| PCB-4 |
0.68Ω Resistor |
R1210 |
4 |
| PCB-5 |
AT8236 |
SOP8 |
4 |
| PCB-6 |
Tact Switch |
KEY-SMD_B3U-1000PM |
2 |
| PCB-7 |
CH32V203C8T6 MCU |
LQFP48 |
1 |
| PCB-8 |
MX3.0 Connector |
4pin 2*2 |
1 |
| PCB-9 |
2.54mm Pin Header |
4pin 2*2 or 8pin 2*4 |
2 |
| PCB-10 |
SMBJ24CA |
DO-214AA |
1 |
| PCB-11 |
TP75176E-SR |
SOP8 |
1 |
| PCB-12 |
WS2812B LED |
5050 |
5 |
| PCB-13 |
10Ω Resistor |
0603 |
2 |
| PCB-14 |
120Ω Resistor |
0603 |
1 |
| PCB-15 |
PSM712 |
SOT23-3 |
1 |
| PCB-16 |
PH2.0 Cable |
10Pin |
4 |
| No. |
Name |
Package/Model |
Quantity |
| PCB-17 |
3.3V Power Module |
24V-3.3V |
1 |
| No. |
Name |
Package/Model |
Quantity |
| PCB-18 |
TPS54202DDCR |
SOT23-6 |
1 |
| PCB-19 |
47pF Capacitor |
C0603 |
1 |
| PCB-20 |
15kΩ Resistor |
R0603 |
1 |
| PCB-21 |
68kΩ Resistor |
R0603 |
1 |
| PCB-22 |
22uF Capacitor |
C0805 |
3 |
| PCB-23 |
10uH Inductor |
7.3×6.8mm |
1 |
¶ Mainboard with Enhanced Security Patch
Click here to expend
| No. |
Name |
Package/Model |
Quantity |
| PCB_1 |
22uF |
C1206 |
1 |
| PCB_2 |
100nF |
C0603 |
12 |
| PCB_3 |
MX3.0 Connector |
4pin 2*2 |
1 |
| PCB_4 |
PH2.0 Connector |
PH2.0/10P (Horizontal SMT) |
4 |
| PCB_5 |
SMBJ24CA |
SMB_L4.6-W3.6-LS5.3-BI |
1 |
| PCB_6 |
PSM712-LF-T7 |
SOT-23-3_L3.0-W1.7-P0.95 |
1 |
| PCB_7 |
1N5819WS |
SOD-323_L1.8-W1.3-LS2.5 |
1 |
| PCB_8 |
SS54 |
SMA_L4.4-W2.8-LS5.4 |
1 |
| PCB_9 |
HDR-M_2.54_1x4P |
HDR-TH_4P-P2.54-V-M |
2 |
| PCB_10 |
WS2812B |
5050 |
1 |
| PCB_11 |
AO3401A |
SOT-23_L2.9-W1.3-P1.90 |
1 |
| PCB_12 |
680mΩ |
R1210 |
4 |
| PCB_13 |
10Ω |
R0603 |
3 |
| PCB_14 |
120Ω |
R0603 |
1 |
| PCB_15 |
470Ω |
R0603 |
1 |
| PCB_16 |
10kΩ |
RES-ARRAY-SMD_0603 |
3 |
| PCB_17 |
Tact Switch |
KEY-SMD_B3U-1000PM |
2 |
| PCB_18 |
CH32V203C8T6 |
LQFP-48_L7.0-W7.0 |
1 |
| PCB_19 |
TP75176E-SR |
SOP-8_L4.9-W3.9 |
1 |
| PCB_20 |
AT8236 |
ESOP-8_L4.9-W3.9 |
4 |
| No. |
Name |
Package/Model |
Quantity |
| PCB-28 |
3.3V Power Module |
24V-3.3V |
1 |
| No. |
Name |
Package/Model |
Quantity |
| PCB_21 |
10uH |
IND-SMD_L7.3-W6.8 |
1 |
| PCB_22 |
100nF |
C0603 |
1 |
| PCB_23 |
47pF |
C0603 |
1 |
| PCB_24 |
15kΩ |
R0603 |
1 |
| PCB_25 |
68kΩ |
R0603 |
1 |
| PCB_26 |
22uF |
C0805 |
2 |
| PCB_27 |
TPS54202DDCR |
SOT-23-6_L2.9-W1.6 |
1 |
The number you see has been multiplied by four extruder channels.
¶ Original version Sub-board for BMCU-A and BMCU-B
Click here to expend
| No. |
Name |
Package/Model |
Quantity |
| PCB_1 |
100nF |
C0603 |
12 |
| PCB_2 |
PH2.0 Connector |
PH2.0/10P (Horizontal SMT) |
4 |
| PCB_3 |
WS2812B |
5050 |
4 |
| PCB_4 |
LED_0603-R |
LED_0603 |
8 |
| PCB_5 |
470Ω |
R0603 |
8 |
| PCB_6 |
1kΩ |
R0603 |
8 |
| PCB_7 |
10kΩ |
RES-ARRAY-SMD_0603-8P-L3.2-W1.6-BL |
8 |
| PCB_8 |
AS5600(with radial magnet) |
SOIC-8_L4.9-W3.9-P1.27-LS6.0-BL |
4 |
| PCB_9 |
LM393DR2G |
SOIC-8_L5.0-W4.0-P1.27-LS6.0-BL |
4 |
| PCB_10 |
ITR9606 |
OPTO-TH_4P_ITR9606 |
8 |
Click here to expend
| No. |
Name |
Package/Model |
Quantity |
| PCB_1 |
100nF |
C0603 |
28 |
| PCB_2 |
PH2.0 Connector |
PH2.0/10P (Horizontal SMT) |
4 |
| PCB_3 |
WS2812B |
5050 |
4 |
| PCB_4 |
WS2812B |
4020 |
4 |
| PCB_5 |
470Ω |
R0603 |
8 |
| PCB_6 |
10kΩ |
R0603 |
16 |
| PCB_7 |
AS5600(with radial magnet) |
SOIC-8_L4.9-W3.9-P1.27-LS6.0-BL |
4 |
| PCB_8 |
ITR9606 |
OPTO-TH_4P_ITR9606 |
4 |
| PCB_9 |
OH49E-S |
SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR |
4 |
| PCB_10 |
LMV358 |
SOP-8_L4.9-W3.9-P1.27-LS6.0-BL |
4 |
Click here to expend
| No. |
Name |
Quantity |
Note |
| MEC-1 |
MR85ZZ Bearing |
8 |
|
| MEC-2 |
BMG Gear Set |
4 |
|
| MEC-3 |
D5x22mm Shaft |
4 |
|
| MEC-4 |
D2x10mm Shaft |
16 |
Better have >20 |
| MEC-5 |
D2x20mm Shaft |
12 |
Better have >20 |
| MEC-6 |
20082B Dual Spur Gear |
8 |
|
| MEC-7 |
182A Gear |
8 |
|
| MEC-8 |
242A Gear |
4 |
|
| MEC-9 |
682A Worm Gear |
4 |
|
| MEC-10 |
FF-130 SH Motor |
4 |
DC12V-4350RPM |
| MEC-11 |
Wire (5cm or longer) |
8 |
|
| MEC-12 |
62B Bushing |
28 |
Better have >35 |
| MEC-13 |
PC4 Pneumatic Head 6mm |
4 |
|
| MEC-14 |
Spring 0.5*6x10mm - W0.5 OD6 L10 mm |
4 |
Bigger spring for the buffer |
| MEC-15 |
Spring 0.6*4x10mm - W0.6 OD4 L10 mm |
4 |
Smaller spring for lever |
| MEC-16 |
M2*8 Countersunk Self-tapping Screw |
50 |
|
| MEC-17 |
1.75mm Transparent Filament |
20cm |
For guiding the light from sub-board |
| MEC-18 |
M2*4 or M2*6 Head Screw |
8 |
For fixing the sub-board |
| MEC-19 |
M3*14 Countersunk Self-tapping Screw |
9 |
Base and cable cover |
| MEC-20 |
MX3.0-4P Mirrored Cable |
1 |
|
| MEC-21 |
M3*10 Standard Screw |
2 |
For bracket |
| MEC-22 |
M3 Nut |
2 |
For bracket |
| MEC_23 |
PH2.0 10pin cable 80mm |
4 |
Recommended 1100mm + 380mm |
Currently we prefer to use clutches with springs, for which you will additionally require:
| No. |
Name |
Quantity |
Note |
| 🟢➕MEC-24 |
Spring 0.2*3.5*5 |
4 |
For clutchs |
The 130 steel ball version is not an official version from the author, but in short, if you want to build the steel ball version, you will need additional:
| No. |
Name |
Quantity |
Note |
| 🟢➕MEC-4 |
4 more 182A Gear |
4 |
total 4+8=12 |
| 🟢➕MEC-25 |
Spring 0.3*4*5 |
4 |
For steel balls |
| 🟢➕MEC-26 |
5mm steel balls |
4 |
|
Click here to expend
| No. |
Name |
Quantity |
Note |
| MEC-1 |
MR85ZZ Bearing |
8 |
|
| MEC-2 |
BMG Gear Set |
4 |
|
| MEC-3 |
D5x22mm Shaft |
4 |
|
| MEC-4 |
D2x10mm Shaft |
8 |
Better have >20 |
| MEC-5 |
D2x20mm Shaft |
8 |
Better have >20 |
| MEC-6 |
182A Gear |
8 |
Better have >12 |
| MEC-7 |
682A Worm Gear |
4 |
|
| MEC-8 |
370 Motor |
4 |
DC24V-6000RPM |
| MEC-9 |
Wire (5cm or longer) |
8 |
|
| MEC-10 |
62B Bushing |
24 |
Better have >35 |
| MEC-11 |
PC4 Pneumatic Head 6mm |
4 |
|
| MEC-12 |
Spring 0.6*4*15 - W0.6 OD4 L15 mm |
4 |
For lever |
| MEC-13 |
Spring 0.6*10*30 - W0.6 OD10 L30 mm |
4 |
For buffer, 0.6*12*30 is also recommended |
| MEC-14 |
M2*8 Countersunk Self-tapping Screw |
36 |
Better have >50 |
| MEC-15 |
1.75mm Transparent Filament |
20cm |
|
| MEC-16 |
M2*4 or M2*6 Self-tapping Screw |
8 |
For fixing sub-boards |
| MEC-17 |
M3*14 or M3*16 Self-tapping Screw |
6 |
4 for fixing the extruder to the base,2 for bracket |
| MEC-18 |
MX3.0-4P Mirrored Cable |
1 |
|
| MEC_19 |
PH2.0 10pin cable 80mm |
4 |
Recommended 1100mm + 380mm |
Click here to expend
| No. |
Name |
Quantity |
Note |
| MEC-1 |
MR85ZZ Bearing |
8 |
|
| MEC-2 |
BMG Gear Set |
4 |
|
| MEC-3 |
D5x22mm Shaft |
4 |
|
| MEC-4 |
D2x10mm Shaft |
8 |
Better have >20 |
| MEC-5 |
D2x20mm Shaft |
12 |
Better have >20 |
| MEC-7 |
182A Gear |
12 |
Updated to 12 |
| MEC-9 |
682A Worm Gear |
4 |
|
| MEC-10 |
370 Motor |
4 |
DC24V-6000RPM |
| MEC-11 |
Wire (5cm or longer) |
8 |
|
| MEC-12 |
62B Bushing |
30 |
Better have >35 |
| MEC-13 |
PC4 Pneumatic Head 6mm |
4 |
|
| MEC-14 |
Spring 0.6*4*10 - W0.6 OD4 L10 mm |
4 |
For lever, now spring is longer 10 |
| MEC-15 |
Spring 0.6*10*30 - W0.6 OD10 L30 mm |
4 |
For buffer, 0.6*12*30 is also recommended |
| MEC-17 |
M2*8 Countersunk Self-tapping Screw |
36 |
Better have >50 |
| MEC-18 |
1.75mm Transparent Filament |
20cm |
|
| MEC-19 |
M2*4 or M2*6 Self-tapping Screw |
8 |
For fixing sub-boards |
| MEC-20 |
M3*14 Self-tapping Screw |
2 |
2 for the bracket |
| MEC-21 |
M3*14 Machine screws |
4 |
For fixing the extruder to the base |
| MEC-22 |
M3 nuts |
4 |
For locking extruder with machine screws |
| MEC-23 |
MX3.0-4P Mirrored Cable |
1 |
|
| MEC-24 |
5mm steel balls |
4 |
|
| MEC-25 |
Spring 0.3*4*5 - W0.3 OD4 L5 mm |
4 |
For steel balls |
| MEC_26 |
PH2.0 10pin cable 80mm |
4 |
Recommended 1100mm + 380mm |
Click here to expend
| No. |
Name |
Quantity |
Note |
| MEC_1 |
MR85ZZ bearing |
8 |
|
| MEC_2 |
BMG gear kit |
4 |
|
| MEC_3 |
D5x22mm shaft |
4 |
This shaft has accuracy problems, pick a small tolerance before using it. |
| MEC_4 |
D2x20mm shaft |
16 |
|
| MEC_5 |
182A gear |
12 |
Better have some more for backup |
| MEC_6 |
682A worm gear |
4 |
|
| MEC_7 |
RS370 motor 24V 6000RPM |
4 |
|
| MEC_8 |
M3*5 metric screw |
4 |
For fixing the motor |
| MEC_9 |
Wires |
8 |
>=5cm |
| MEC_10 |
62B shaft sleeve |
32 |
|
| MEC_11 |
PC4 pneumatic fitting 6mm |
4 |
Or 8 if you want to install both side |
| MEC_12 |
5MM stainless steel balls |
4 |
|
| MEC_13 |
Spring 0.3*4*5mm - W0.3 OD4 L5 mm |
4 |
For steel ball |
| MEC_14 |
Spring 0.6*4x10mm - W0.6 OD4 L10 mm |
4 |
For lever |
| MEC_15 |
Spring 0.7*12*25mm - W0.7 OD12 L25 mm |
8 |
For buffer，in case insufficient pressure, replace by D0.8 |
| MEC_16 |
M2*8 countersunk self-tapping screw |
48 |
|
| MEC_17 |
1.5mm optical fiber |
20cm |
or transparant PETG filament |
| MEC_18 |
N35 3*20mm cylindrical magnet |
8 |
You can also buy two 3*10 sucked together for future use with CMCUs |
| MEC_19 |
M2*8 countersunk self-tapping screw |
4 |
|
| MEC_20 |
M3*14 countersunk machine screw |
4 |
|
| MEC_21 |
M3 hex nut |
4 |
|
| MEC_22 |
MX3.0-4P mirrored cable |
1 |
|
| MEC_23 |
PH2.0 10pin cable 80mm |
4 |
Recommended 1100mm + 380mm |