My SV06 works fine. I’ve printed amazingly complex prints meant for resin and the machine just keeps chugging along perfectly. I had one filament blowout where I had to replace the hot end. No big deal. I’ve had bolts come loose that have been fixed with Loctite. But I fear it’s finally dead. Check this.
Whenever the hot end has been heated, to any temperature, and it crosses the 172mm mark on the x-axis, either by starting a print or by moving it under the PREPARE menu option, I get the error in the subject and everything locks up. I have swapped to a completely new hot end and it still happens. I’ve checked every wire from the wall plugin through the PSU, to the LED screen, all throughout the printer to where they end at the motherboard. Everything is connected and tight. I’ve reflashed the firmware, made sure every gantry was square, checked for anything that might be physically impeding the movement along the x-axis, lubricated the rod and even the bearings inside, tested three different filaments at different temperatures. printed small models that don’t break the 172mm mark, made sure there were no homing errors, but it seems to understand exactly where the zero point is (it used to grind against the left side of the x-axis as if it thought it hadn’t reached zero, but that’s been long fixed), made sure the gcode Cura was producing didn’t have strange instructions, thoroughly examined the x-axis stepper motor, made sure the tension belt was properly adjusted, used Pronterface to give it direct commands to move past 172mm.
The only things left are internal fails in the x-axis stepper motor, or a failing stepper driver on the main board, itself. There are no other options left. But in both of those options, I don’t know why it would tell me that the hot end was failing. It makes absolutely no sense. I’ve been told that M122 will give me a stepper diagnostics report that might indicate overtemp, undervoltage, or error flags.That’s the end of my knowledge.
So, right now I have a great SV06 with a 220x171 hot bed. Any ideas?
The X-Axis part is confusing…and I know you checked everything you can think of.
In the past Sovol has said to swap the 2 thermistor ports & see if the problem follows.
So, if you haven’t already, I would give that a try. (Nozzle & Hot Bed)
Very interesting. There is no difference between the two sets of connections? I would think that the hot bed connection would need significantly less power than the hot end and they would take that into consideration when designing the board. I’d hate to short out the bed. Maybe I’ll disconnect both, put the bed one on the hot end connection and see how that works without heating the bed at all. Just change a single variable at a time. This would be a bizarre fix. But, thanks for even replying! I didn’t expect anyone would have any suggestions.
Well, that did exactly what I thought it would. The wire that thought it was connected to the bed thermistor freaked out when it hit 100 degrees. There’s a built-in runaway heat monitor, just like there should be, so the hot end can’t go over 100 degrees with them switched. I’m glad I didn’t tell the bed to try to heat to 215 degrees. That might have been interesting. Thank you for your suggestion, though. I’ll take anything right now. I know there’s no point taking it in somewhere to see if it can be repaired. That would cost just as much as buying a new one. Damn. I can’t even level the bed to print on the left hand side because that needs to heat it up to 120. I’ll have dig out my USB cord and try the M119 command with Pronterface. After that, I’m screwed. I hear good things about the SV08 or the Creality Hi, but that’s not open source. Sh*t.
It sounds like it is the cable (to the relevant thermistor), but you have checked that. Could it be strain on the cable that moves / wiggles a connector as the X axis moves right?
Sounds to me like you have a broken wire in the umbilical to the tool head. The insulation holds the wire with the ends touching until a specific angle (corresponding to X172). Get an old school thermistor with a long wire and preinstalled plug. Install it to the hot end and run it directly to the motherboard. Tape/tiewrap it to the umbilical and test.
Double check that your firmware is ser for a NTC 3950 100K Thermistor. Pronterface and M503 should list it but you may have to refer to the table at Marlin to decode an “index number”
Note all the other wires in the umbilical have the same number of bending cycles. If the new thermistor wire “fixes” your issue I’d strongly recommend replacing the umbilical.
Was the “grinding against the left side” a pinched wire? That could be the root cause.
If you want to try and repair the umbilical the thermistor wires are #23-24 on the EDGE of the ribbon. #24 probably got pinched long ago Adapter board-motherboard cable (1).pdf (533.3 KB)
I wrote to Sovol to see what recommendations they had. They said to totally remove the x-axis cable and the y-axis cable from the motors and from inside the MCU case. Then swap them. If the y-axis then screwed up, it would definitely be that cable. If not, they said there had to be some message from the MCU not transmitting properly. I did this. I ripped apart everything… I’m going to add a 120mm fan to the MCU like I did for the PSU… and switched the cables, and with the guts of this thing spilled all over the table, it started working again. The y-axis was fine. The x-axis was fine. So I switched the cables back to the correct ports and motors, heated up the nozzle to 300 and the bed to 100 to see if I could kill it, and everything worked fine. I changed the temps back to 215 and 60 and tried to print a .gcode file that crossed the dreaded 171 boundary. It worked perfectly. I don’t know what I jiggled or pressed or shoved the right way, but it works just like new. I have absolutely no idea.I hate that. But I have a working printer.
I still bet you have a broken thermistor connecting wire in the umbilical (#24 most likely). Moving the printer caused the umbilical to “lay” differently so that for the time being the ends of the broken wire are being pressed together.
