CANbus module recommendation, please

General Discussion
1

Greetings!
I wonder if it is a good practice to wire a CANbus module to the control board (MKS-SGEN v2) and use it to control EBB36 from Klipper, installed on Raspberry PI?
If not, can I wire a module directly to the pins on the rpi and should I expect delays with the communication with EBB36 and the extruder stepper wired to it in both scenarios?
What CANbus modules would you recommend, besides Biqu U2C USB-CAN bridge?

2

The short answer is no. The MCU’s CAN1 pins are devoted to Z_EN & Z_STEP. The CAN2 pins are used for toolhead heaters.

So, to use them, you would have to disable either a stepper motor or your toolhead heaters.

Why would you want to do that because…

I would recommend the straight Canable:

https://canable.io/

Just plugs in via USB to the rPi, supported by Klipper and it’s cheap.

The BTT U2C adapter has a number of connectors which are…weird and very poorly/not at all documented. The Canable is much more straightforward to use.

3

Thank you for shedding light on this, mykepredko! I am trying to figure out what would be the most optimal wiring for my newly designed 3d printer.

So even if I can reassign available controller board pins to a CANbus module it is not a good idea? I am also trying to find a cheap solution.

4

There are no available controller board pins for CAN. I guess you could tear it apart, but you’ll have to rewire a stepper or do your board heating another way.

Look for the Fsetc Canable board - you should be able to get it for less than $10 on AliExpress and probably on Amazon (I don’t know where you live, so these might not be viable options).

Personally, I wouldn’t even consider cutting into your controller board, especially when there are very inexpensive USB to CAN options available to you that will plug into your rPi simply using USB.

5

Also :

  • MKS CANable (tiny, love them, perfect fit for a Voron 0)
  • UART to CAN (tiny, could be used as a cable adapter, protected with some shrink) ; I have a couple, but never used them…
    In Europe, both are available on Amazon
6

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