These are wire resistances?
These make no sense. Both the mainboard and the toolhead board should measure 120 Ohms.
I’m ASSUMING the buffer_MCU is non terminated. It may be instructive to unplug the 4 wire plug going to the buffer and booting the machine. It will error but may allow the toolhead to connect,
Check these links for tips and tricks:
Have you contacted Sovol support? Have they offered any solutions?
Sorry I misunderstood what you were asking. I measured the wires and not the pins on the boards themselves. The Main board was 59 ohms and the toolhead was 118 ohms.
Unplug the 4 pin buffer connector from the motherboard and recheck board resistance.
Your first log has MANY resets of the Buffer MCU. I’m wondering if the buffer is bad.
Of you edit printer.cfg in Mainsail/Fluidd and put a # in front of [include buffer_stepper.cfg] then boot with the buffer unplugged, klipper should load without error. 1/2 of the macros depend on the buffer so they’ll error but we’ll learn about the toolhead communication.
Removing the buffer took it to 118 omhs.
@sovol3d What should be the resistance on the buffer can lines? The CAN transceiver should be > 1 megOhm. The bus is terminated at the MCU and extra_mcu, there shouldn’t be anything other than the transceiver attached to CANh or CANl on the buffer.
@Jaggars80 have you tried powering the printer up with the buffer unplugged?
I unplugged the buffer and commented it out in the printer.cfg file and I get an error of “mcu buffer_mcu: Unable to connect”
Rename printer.cfg → printer.cfg.old then upload the attached:
printer_minimal_test.cfg (9.3 KB)
And rename to printer.cfg. Reboot the printer (buffer unplugged at mainboard.
In the console enter;
G28
QUAD_GANTRY_LEVEL
BED_MESH_CALIBRATE
SAVE_CONFIG
Ok the printer will not run with the buffer unplugged, it just gives the buffer error and restarts. I did try what you instructed with the buffer plugged and the first try it gave me an eddy current sensor error. I tried again it all worked and then I tried to do a test print and immediatly the homing x error popped up.
I’m at a loss to explain the results you are seeing.
How are you editing/moving/renaming files? There are multiple copies of the config files in other folders (back ups and templates). It is possible you are working in the wrong folder.
The path you need is /home/sovol/printer_data/config/printer.cfg
If you copy the test config I sent to that file and reboot, klipper no longer knows anything about the buffer and should initialize without error with the buffer unplugged.
Sovol has f**ed up the log process such that the “runtime” configuration is no longer copied to klippy.log so I cannot see what configuration is loading. If you has vanilla Klipper it would be easy to see which config is actually being loaded.
Ok I did put it in the wrong folder. I just put it in the correct one and the printer started up. I ran the commands as well. The bed mesh one would not work. Here is the Klippy log.
klippy_8_3_26.zip (396.8 KB)
Your log doesn’t have a session with no buffer_MCU or failed mesh attempt.
Use fluid/mainsail to rename klippy.log → klippy.log.old
Open printer.cfg and verify the test config is loaded THEN click [save and restart].
Run the console commands above.
Post the new klippy.log here.
After running just the G28 code I get an lost connection to mcu error.
klippy_8_4_26.zip (10.3 KB)
Well that didn’t go as expected.
Your resistance measurements made me think there was a problem with your buffer. The CAN bus still is a mess with only 2 nodes.
I could write a new .cfg with no toolhead and see if you can talk to the buffer EXCEPT without the toolhead you’d need a 120 ohm resistor to put across the pins at the buffer.
My current opinion is you have bad board, main or toolhead I can’t decide.
What has Sovol support said?
I reached out to Sovol twice with no answer. That’s when I turned to this forum. This is the second toolhead I have put on the machine. On the first one the case popped off and the resistors fell out. It was very weird. So we bought two more toolheads just in case. Maybe it is the main board. For $1,200 this thing should not be this much trouble. We have many of the Comgrow T500’s and only a few of them had a minor issues to resolve like the stop sensor being misaligned, but they all work. This printer worked for about 2 weeks and then all the errors started. I do appreciate all your help.
@sovol3d Can you check into this?
Has @sovol3d ever responded to you before?
Of course, they always respond.
Except when they are day off.
They are usually quick to respond. The time difference makes it 1 question 1 reply a day so it does take some time to work thru troubleshooting.
Whenever a new printer is being released, they do slow down a little.