Exactly.
I haven’t gone back through the whole thread, but was the eeprom cleared out and reset at any point? Following a Marlin upgrade (years ago) I had some issues I thought were firmware related, but turns out the “layout” of values stored in the eeprom changed, so nonsense values stored previously were causing aberrant behavior.
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Hey Tom, yes it was several times, before and after I loaded the firmware.
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I guess while we are on that subject can you take a quick look at your accel values. A bunch of mone were at 50k instead of ~3k. I know I cleared my eeprom as well so it might be a firmware setting gone bad.
I checked and they are all 3K, no changes here.
I will play with the printer a little more when I get home, hope to get the first print out tonight. I only have couple of days before a week long work trip.
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I have a weird one for you.
That new repeat I have been having issues with, odd accels, beat up grub screws, poor prints, every time the second layer was shifted even though I rebooted, new gcode…I removed the microSD and it is perfect now. Reinitialized the eeprom and the accels are perfect.
I had issues on my MPCNC as well. For some reason I pulled the card to flash it and it fixed it there as well. I do not remember what that issue was but it was a few months back.
I am wondering if the micro SD is the cause of your problems as well. I see it is in, in all the pictures.
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That is a great point. I will try the “busted” board again without the SD card.
I agree with all of you, make no sense the board been the problem, everything point to “Firmware/human error” issue.
I just paused the printer to show this.
The nasty one in front is with the card in. The one behind is currently printing. Only difference is no card in the board.
Sooooo weird.
Any chance there’s a file on the board being treated as autostart gcode that’s messing with settings? See Marlin Documentation
I hope not. The SKR does rename the firmware file so it should not read it. I am thinking it is some sort of shared pin situation…but that is pure speculation.
I would not be surprised if having an SD card in the slot was causing pausing, while it handled sd card interrupts, or reading the card contents for some reason. I would be surprised if that ended up changing settings like acceleration. But stranger things have happened.
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One thing I did after several attempts were replace the SD card. It was formatted clean. I’m sure I had no files in it.
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FWIW, I have only ever actually RUN the printer with no SD card in the board slot… Though I was hoping to be able to use the board slot. Maybe I won’t…
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The printer is alive!!!
Got home late and tired. Spend couple hours playing with it and the slicer and got my first print.
For the first print I think it is pretty damn good …
I still need to run linear advance, some more test prints and tweak the Slicer.
That Cube was done with 0.6mm nozzel, 0.35 layer Height and 100mm/s speed with all other speeds set by the Prusaslicer… (0 mm/s or %)
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Looks great!!!
I think at this point it is mostly a cooling issue. Either lower the minimum layer time or start printing larger stuff! I find at the higher speeds you have to print two or three of the test items at the same time or you never hit full speed.
I am printing more full plates now. The leveling makes that possible without worries, and it gives each layer a bit more time to cool. Feeling like my print times are already about half the MP3DP V2 with a bit better quality on top of that.
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I’m guessing you are making parts for the store? That is a pretty exciting milestone for a new printer.
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Yes I think you are right, I will do another run with 3 or more test cubes.
I need to get a new heated bed for this printer, even though it is brand new, with Z leveling and ABL I still see high and lows in the skirt lines… I should have droped a glass to the bed before adding the magnitic print surface…
I also will push the printer to the limit, I want to see how fas It can go 
I think the FW is set to 200?? I will bring that up to 400
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So, I got back late last night and this morning I isntall the “old board” back, reflash the firmware, try with sd card in and it did the same thing.
Removed the SD Card, reinitialized the eeprom and the problem is gone!
WTF…
@vicious1 You are right… SD Card was the issue…
No more SD Card on any BTT boards…
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I added notes to the instructions in two places. I hope everyone sees it.
Glad the board is good!
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Me too…
I still don’t understand why the SD Card would cause any of the problems.
And Thank you for pointing that out.
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