BIGTREETECH U2C V2.1 Adapter Board Supports CAN-Bus Connection, with 3 CAN Output Interface for 3D Printer DIY

good for usb-to-can adaptation in a voron 2.4, if you want to go this route. it's not really necessary in most builds i think, but regardless it's held strong and has no issues.. except for accidentally running 110v directly into the first one and burning it up. don't do that and you'll be fine.

Works great to add CAN Bus to 3d printer mainboards that dont have these connections! Easy to configure and install, no janky MacGyvering of wires

Instructions on BTT github are poor, but once through that, it's a flawless addition to 3d printer. Flash with Candlelight firmware noted in instruction doc and you are done.

I was happy with this CAN adapter. I used it to help isolate a CAN bus issue I was experiencing with one of my Voron builds (I used it to bypass the on-board CAN bridge on the Octopus board). In the end I ended up leaving this board in place on that build, and it has performed without issue.

Using it what it was intended for, a way to add CAN bus to my Voron2. Connected 24Vdc to power it, routed it to my PI via USB, wired CAN TX RX to the toolhead wires provided for my EBB RP2040 from BTT. Was talking to it as soon as I configed my PI using Katapult software. Make sure you go to BigTreeTech's GIT page and download the assets for the project used in conjunction of whichever path you chose for upgrading your toohead.

When I got the board it appeared to have a working Candle already flashed so I happily moved on to flashing Canboot to the EBB42 via USB and then reconnecting the EBB42 to the U2C via CAN, attempting to flash Klipper via CAN and failing. Drove me nuts for a couple of days. Then I got help that told me there was a bug in the Candle that came on the U2C and I needed to flash the latest version from BTT github. Once I did that I was able to successfully get the EBB42 flashed and everything working. So save yourself from lots of aggravation and update the U2C right away.

This Company comes up with the products you want, but other than the hardware, everything else is lacking. Their support for their products is spotty at best! You are basically on your own to figure out how to make their products work(even in conjunction with their own products). Their customer support is hit or miss, and they often show product in stock that in reality aren't. This results is unknow and uncommunicated delays, and when you finally realize you have to reach out to see where your stuff is, the response is very apologetic, but lacks any real information or details about when you might actually receive the parts they originally told you were in stock and ready to ship. Again, Good hardware....Bad everything else!!

Spent several days trying to figure out why I couldnt get the CAN network up and running. Turns out the firmware that was installed was out of date and would crash when trying to configure the CAN network with the BTT SB2240. Once the firmware was updated, it has worked great!

In theory, this is a great item. The first one had a dead canbus transceiver, so it was returned. The replacement worked no issues. For anybody connecting Canbus, power the toolhead board on a 5V fuse direct from the PSU. There is no need to run 24V through the circuitry of the U2C. Be careful when connecting the 4 pin connectors for power and canbus. The pins are as if you are looking at the front of the connector. I read so many places where people got these mixed up. The U2C us the opposite (at least on mine) from the EBB-36 & EBB-42 tool boards. The gen 2 tool boards now use a specific connector that cannot be messed up.

Worked with klipper right out of box, only thing if using canbus over USB (SKR3 mini e3 for example on PA 11/12 make sure to use VBUS jumper on the u2c (for respective port 1/2) the manuaal sucks but the product is amazing, came flashed with candlelight zero config. running EBB 42 MCU, SKR3 mini E3 MCU, and RP2040 with can transceiver running my filament heater box/ filament sensor, and ventilation/dampers

I updated to firmware first thing, then was able to use it with my EBB with no issues

Had problems connecting btt manta m8p v1.1 board to canbus this fixed the problem somehow.👍🏽

The documentation from BigTreeTech is terrible! I also could not get it to work out of the box and had to reflash the firmware. However the saving grace is the 3d printing community has stepped up and created a good number of resources. Furthermore You can flash Catapult and Klipper on it and then it will work as intended. I haven't done enough testing yet to know if it is reliable long turn.