A daughter board that mounts on a 3D printer hotend assembly to enable wiring over RJ45.
This document provides technical information about this module.
DISCLAIMER: We are not responsible for accidents or problems caused by your use or misuse of these modules.
This PCB was designed with KiCad EDA v5.1.9 from the debian buster-backports repository.
- Form factor 80mm x 41mm
- Lead-free, RoHS compliant
- PCB traces are 0.5mm and can support at most 1A of current
- High-current PCB traces are 3.0mm and can support at most 3.9A of current (2A tested)
- High-current PCB traces are doubled on both sides of the PCB (for possibly ~7.8A current - not tested)
- Grounded M3 mounting holes connected to GND pins
- Certified Open Source Hardware licensed under CC BY-SA 4.0
Here's a render of the PCB from the front side:
Left side as viewed from the front:
| Pin number / letter | Device | Type | Twisted pair |
|---|---|---|---|
| a | Parts fan | High-current | no |
| b | Parts fan | High-current | no |
| - | Parts fan (GND) | Low-current | no |
| 2 | Parts fan | Low-current | yes (pin 1) |
| e | Thermistor | High-current | no |
| f | Thermistor | High-current | no |
| - | Hotend fan (GND) | Low-current | no |
| 1 | Hotend fan | Low-current | yes (pin 2) |
| 3 | ADXL (GND) | Low-current | yes (pin 6) |
| 4 | ADXL | Low-current | yes (pin 5) |
| 5 | ADXL | Low-current | yes (pin 4) |
| 6 | ADXL | Low-current | yes (pin 3) |
| 7 | ADXL | Low-current | yes (pin 8) |
| 8 | ADXL | Low-current | yes (pin 7) |
Right side as viewed from the front:
| Pin number / letter | Device | Type | Twisted pair |
|---|---|---|---|
| c | Heater | High-current | no |
| d | Heater | High-current | no |
| e | Thermistor | High-current | no |
| f | Thermistor | High-current | no |
| - | Probe (GND) | Low-current | no |
| 1 | Probe | Low-current | yes (pin 2) |
| 2 | Probe | Low-current | yes (pin 1) |
| 4 | Probe | Low-current | yes (pin 5) |
| 5 | Probe | Low-current | yes (pin 4) |
| 3 | E-Motor | Low-current | yes (pin 6) |
| 6 | E-Motor | Low-current | yes (pin 3) |
| 7 | E-Motor | Low-current | yes (pin 8) |
| 8 | E-Motor | Low-current | yes (pin 7) |
See the HOWTO docs for Alternate wiring alternate wiring of the endstop, thermistor, and parts fan.
A PDF version of the schematic can be downloaded here
Below is the BOM list of through-hole components for one PCB:
| Quantity | Item and Description | Datasheet | Digikey Part # |
|---|---|---|---|
| 2 | RJ45/8P8C connector | Assmann-RJ45-connector.pdf | A-2004-2-4-LP/FS-N-R |
| 2 | 2-pin JST-XH male and female connector (4 pcs) | JST-XH connector.pdf | B2B-XH / XHP-2 |
| 1 | 4-pin JST-XH male and female connector (2 pcs) | B4B-XH / XHP-4 | |
| 1 | 5-pin JST-XH male and female connector (2 pcs) | B5B-XH / XHP-5 | |
| 1 | 6-pin JST-XH male and female connector (2 pcs) | B6B-XH / XHP-6 | |
| 19 | JST-XH socket for crimping | SXH-001T-P0.6 | |
| 6 | 2-pin JST-VH male and female connector (12 pcs) | JST-VH connector.pdf | B2P-VH-FB-B |
| 12 | JST-VH socket for crimping |
This project has been fully documented since its inception. It can be viewed on Hackaday. Care has been taken to document various design decisions and the technical details behind each iteration.
Now that you've read the technical reference, feel free to browse the other documents below:
- EXPLAIN: learn the story behind this PCB, safety information, and OSHW
- HOWTO: more detailed information on testing and wiring patterns
- TUTORIALS: a quick guide to get started using this module
μ3D: RatRig V-Core 3 EVA wiring over RJ45 and documentation © 2021 by Alexander Williams is licensed under CC BY-SA 4.0 (Attribution-ShareAlike 4.0 International).