Homing Fails? #104
Replies: 3 comments 5 replies
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Try running M502_FACTORY.gcode again, without the M92 adjustment. MPMD V1's were shipped with either 1/8 or 1/16 microstepping on the mainboard. It's hard to say which mainboard you have without seeing the EEPROM settings that previously worked with your printer. |
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I tried it both with and without the M92_XYZ57_E48.gcode adjustment, and both ways I run into a Homing Fail error. It happens sooner when I run the M92_XYZ57_E48.gcode. That said, I'm pretty sure the M92_XYZ57_E48.gcode is necessary on my machine. It was one of the units from the original v1 Kickstarter, which would mean it's an "older" model, right? And I'd swear I got it working briefly with the M92_XYZ57_E48.gcode. I'm starting to wonder if it's a hardware problem, though I've seen some people claim (with Marlin software, but on other Delta printers) that adjusting the feed rate down for homing helps. I have no idea how to do that via the SD card, though. |
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You are correct, you need the M92 adjustment. If you want to rule out firmware weirdness, just flash stock firmware. v45 on this page should work: https://github.com/mcheah/Marlin4MPMD/tree/master/firmware%20binaries |
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Thanks, I'll try that! |
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Okay, neither v45 nor v43 worked from the stock firmware. For v45, the printer jams "forward" (toward the display screen side) as if it's trying to reach beyond the edge of the print area. For v43, it does the same except to the middle of the left side. In both cases, the arms are right at the bottom of the tower and seem to be trying to go further. I don't see that kind of problem when I flash with mpmd_marlin_1.1.x-119r16-SM0001-ACfan-10Alimit.bin, which seems to be the right firmware for my model, but somewhere during the AUTO_CALIBRATE step of calibration I still get the homing fail message. The thing that makes me wonder is that this behaviour is "new": I wasn't getting it until adjusted my start code in Cura the other day. Then, suddenly, I started getting Homing Failed errors. (My printer had sat unused for a long time since I was having other problems with it last year and didn't have time to dig into figuring out what was causing them.) The thing is, doing a factory reset and recalibrating should purge everything that some bad start code would have caused, right? I'm getting the error without even running any print with the possibly-weird start code, so it doesn't make sense that the code could have caused this problem, right? The other thing is that last year, I had to reinstall the hot end assembly and also had to partially disassemble the whole machine to get the drive to work on one of the towers, as the rubber ring at the bottom had slipped off. (I'm not using the right terminology, but I guess you can figure our what I mean.) Maybe I did something wrong at that time? I'm not sure. Anyway, I suspect I need to start asking over the MPMD group, rather than here, since you're focused on the firmware. |
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Oh, weird update, though: after starting the AUTO-CALIBRATE function, I slowed down the printer down to half speed and it calibrated. However, when I try to print something, the Homing Failure happens again right at the start of the print process. When I'm quick enough to slow down the printer speed, I get other malfunctions—most recently, the print assembly jammed into the front left tower at an angle when it was trying to home. I checked for loose wires, but couldn't find any, so I'm guessing it's a hardware problem. Unfortunately, I don't know where I could get spare parts or help with fixing it, so I think I'm SOL. Just in case, though, this is the output on after calibration. I can't see anything weird in it, but who knows? FIRMWARE_NAME:Marlin mpmd_marlin_1.1.x-119r16 [SM0001, ACfan, 10Alimit] (Aug 28 2021) SOURCE_CODE_URL:https://github.com/aegean-odyssey/mpmd_marlin_1.1.x PROTOCOL_VERSION:1.0 MACHINE_TYPE:mpmd(ao) EXTRUDER_COUNT:1 UUID:1 echo:busy: processing echo: G21 ; (mm) echo: G21 ; (mm) G21 ; (mm) |
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Hmm, could be a hardware problem, but I'd try the following just to be sure: First, the "factory reset" With mpmd_marlin_1.1.x, executing the sequence of gcode files below should restore the printer's configuration parameters to something that works. Slicer is changing the configuration values If the factory reset does work, and then things go haywire when printing, it posible that the slicer program is adding gcode that alters the printer's configuration and calibration (e.g. M92, M665, etc). If this is the case, it's probably best to disable these "features" of the slicer. A firware quirk Also, when the printer does it's homing calibration, it moves up until it hits the limit switches. A this point the printer (arbitrarily) assigns an initial height (~130mm, I think), and then moves down until it taps the build plate. If for some reason the print reaches "zero" without hitting the build plate, it will generate a fault. More about this in issue #43, but the fix is to bump the initial height up (e.g. M665 H135). If the above measures fail, I would then suspect a hardware problem. Perhaps something here will get your printer working again. |
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Thanks, I tried out the factory reset with the extra save after the M92, and that failed, so I figured it might be a hardware problem. I took off the top, but nothing was visibly wrong there. However, when I took of the bottom, I noticed that a tiny little ribbon strip had become unsoldered from one of the boards. I don't have a soldering iron right now, so I temporarily taped it into place and, bingo, it's (mostly) working. Guess I should pick up a soldering iron and make the fix permanent. I wish I could explain this better, in case anyone else runs into the same problem, but I couldn't find the name of the board online. It's not, from what I can tell, the mainboard. There's a little tan ribbon strip, and mine unsoldered somehow. Easy fix for instant results. Anyway, thanks for the suggestions everyone! Update: I added an attachment with a picture of the board. It's the board behind the display screen and buttons panel, and you can see the tan strip that had to be soldered back on at the bottom right corner of the board. Printer seems to be working properly since that was resoldered.
Though, googling for pictures of this board, it looks like maybe it was not supposed to be attached? I have no idea why the machine started working after I did that. Update 2: Well, it seemed like it was working okay, then it wasn't, but I adjusted the location of the lower belt gear on one tower, where it apparently moved outward (loosening the belt to an extreme), retuned the belts, and now it seems like it might be working so far. I think. Update 3: Problems persisted but I lowered the feed rate in the start code provided here, and that seems to have resolved them. I did this after seeing mention of lowering feed rate helping with this issue on other delta printers, and, we'll see, but it seems to be working properly again now. |
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So, I've searched around and seen that some people have this problem on delta printers, but I haven't figured out how to fix it.
On my MPMD (v1, early model), I was able to configure it once, earlier today. I tried a print, and then halted the print when I noticed that the print head was up high above the print surface and not extruding any filament.
I checked for a clog (none), and then tried to restart the print, but I started getting a "Homing Failed" message. Now, even when I try to recalibrate the printer, I run the following successfully:
M502_FACTORY.gcode
M92_XYZ57_E48.gcode
... and then I get a homing failure when I try to run AUTO_CALIBRATE.gcode. When that happens, the LED on the side (next to the USB drive) starts flashing red.
Any ideas what's wrong? I wasn't getting these homing problems until after trying to print something with a new start code, but now even after a factory reset I'm getting the same issue.
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