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Solved SB2040 and hotend PID loop


Well-known member
I've noticed that since I've switched to a SB2040 (from Octopus) that my displayed or trended pwm or power values are much more erratic. I don't know that it has much effect on my hotend temperature stability. I'm just wondering if anyone else has experienced this.
What type of wire are you using for CAN?
Can you show an example of what your are talking about?
What type of wire are you using for CAN?
Can you show an example of what your are talking about?
The Mellow-Fly SB2040 came complete with a cable. That's what I'm using. I'm guessing the data wires are about 24 awg. I twisted the data wires, but maybe not as well as I should have.

My CAN adapter is a Mellow-Fly UTOC-3. Some communication readings below:

pi@fluiddpi:~ $ ip -details -s link show can0
3: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1024
link/can promiscuity 0 minmtu 0 maxmtu 0
can state ERROR-ACTIVE restart-ms 0
bitrate 1000000 sample-point 0.750
tq 62 prop-seg 5 phase-seg1 6 phase-seg2 4 sjw 1
gs_usb: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..1024 brp-inc 1
clock 48000000
re-started bus-errors arbit-lost error-warn error-pass bus-off
0 0 0 3 26 0 numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535
RX: bytes packets errors dropped overrun mcast
2166927 322369 0 0 0 0
TX: bytes packets errors dropped carrier collsns
3049571 406515 0 0 0 0


The trend shown above looks much better than it did a few days ago. I'm now thinking the erratic readings that I was seeing before today were related to nozzle clogging. I made some changes to address the clogging issue and that seemed to improve hotend stability. What I see today is very comparable to what I saw when the hotend was being controlled by the BTT Octopus.