Before I continue. This modification, if not done correctly, can seriously damage yours printer, harm you or cause a fire and stuff the like this. Still, you're interfering with an eletric device.
Any attempts at your own risk.
I wanted to add MOSFETs to my printer. Decreasing the current flowing through the board comes to me as a good upgrade.
This Anycubic i3 Mega double MKS MOSFET inspired me.
I wanted to model it by myself be sure it fits into the printer and the MOSFETs fit into it. (Also practise with Fusion360.)
The MOSFETs and the SD card holder dimensions are included, in case someone needs it.
What you will need:
- MOSFET for heat bed/extruder (I used this combo from Ali.)
- 8* M3x8 screws
- about 30cm 16AWG cable - For power supply - I bought cables with silicone insulation up to 200 °C in a model shop.
- about 50cm 20AWG cable - For signals - Also silicone ones from model shop.
- corresponding cable terminals (or tinning)
The wiring diagram is quite simple. So in nutshell, I...
- Linked power to MOSFETs by polarity and connected to power supply with 16AWG cable.
- First MOSFET board:
- I disconnected the wires leading into the hotbed from the main board and plugged into the "HOTBED" terminal on the MOSFET board.
- I used 20AWG cables to connect the main board and the MOSFET board ("BED" terminal). Beware of polarity !!
- Second MOSFET board:
- I disconnected the wires leading into the hotend from from the "printer-side" terminal and plugged into the "BED" terminal on the MOSFET board. Beware of polarity !!
- I used a 20AWG cable to connect MOSFET "HOTBED" terminal and "printer-side" terminal.
I did a few tests so far it looks good.
it does not matter