Z height losing very small increments in height for each layerRatOS v2.1.0 - RC4 (bullseye)Update | Rat Rig Community [Unofficial] | Page 1

tidal mirage Mar 10, 2026, 12:24 PM

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Z height losing very small increments in height for each layer

RatOS v2.1.0 - RC4 (bullseye)
Updated to v2.1.0-RC4-6-gcf1248d1

Installed fresh twice. Both FOR firmware ON BTT SKR2 AND RATOS FOR RPI 4
Every seems to work. Wiring seems ok. Homes well with superpinda (replaced BLTouch thinking it was damaged). Calibration and save config (as recorded in printer.cfg) seems to work. Bed mesh and all seem good. First layer goes down real nice. Extruder flow rate and all seems good.
As it’s printing, Z height starts to lessen and nozzle begins to scrape into layers. Checked lead screw thread count. Tried different voltage rate for stepper, etc. etc.etc.

Checked g-codes in slicer. Not messing with the new and complicated macros in Klipper Mainsail files.
Before upgrading to this new OS, EVERYTHING was fine. I can’t solve this and all the research on line. Fabrico Help bounced me here to Discord.

Help.

wraith cargoBOT Mar 10, 2026, 12:24 PM

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twin hinge Mar 10, 2026, 12:31 PM

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tidal mirage Z height losing very small increments in height for each layer RatOS v2.1.0 - R...

Les can you post a RatOS debug? Its under the configurator menu.

tidal mirage Mar 10, 2026, 12:32 PM

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I’m on it right now. Printing file. Will post

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Thank you so much

tidal mirage Mar 10, 2026, 12:52 PM

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📎 ratos-debug.zip

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twin hinge Mar 10, 2026, 12:58 PM

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Was this printer working fine before?

tidal mirage Mar 10, 2026, 12:59 PM

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Yes on the older OS version

twin hinge Mar 10, 2026, 1:01 PM

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your config seems clean. your run current is lower than mine but that may be because you do not have the printer in performance mode. I would enable that to make sure that is not it but I suspect it would run fine without it. Once you do that under the advanced motion setting make sure you pick the tuned preset for that stepper.

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Are you sure your slicer is configured correctly as I am wondering if the extrusion multiplier is off and your are just printing to much filament that may look like its having z issues

tidal mirage Mar 10, 2026, 1:02 PM

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Voltage is not the issue I tried that. I can visually see the nozzle losing height very slowly

twin hinge Mar 10, 2026, 1:05 PM

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when its just sitting there idle?

tidal mirage Mar 10, 2026, 1:06 PM

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While printing

twin hinge Mar 10, 2026, 1:06 PM

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and by voltage I meant the voltage tuned profile that adjusts the run current

tidal mirage Mar 10, 2026, 1:07 PM

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Where is that?

twin hinge Mar 10, 2026, 1:08 PM

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its the image above. Like 2nd to last step of configurator. Make sure performance mode is on and then hit the check box for advanced motion control.

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then make sure it looks like the screen shot I posted earlier.

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your run current for Z is like 2/3 of mine. I do not think it should be loosing steps that way but maybe?

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Check to make sure your X and Y are also on the turned preset as well while you are in there

tidal mirage Mar 10, 2026, 1:18 PM

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This is my interface

twin hinge Mar 10, 2026, 1:21 PM

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Its an SKR2 board?

tidal mirage Mar 10, 2026, 1:23 PM

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Yes stock

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Everything is stock except pinda and psu

twin hinge Mar 10, 2026, 1:25 PM

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they shipped skrat boards for later ones i think but all good. And you confirmed performance mode is on? I am not sure why the tuned profile is showing lower current like that. Again it may have nothing to do with your issue just trying to eliminate anything we can

tidal mirage Mar 10, 2026, 1:27 PM

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I’m going to try with current set to 1.0

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Where is performance mode option

twin hinge Mar 10, 2026, 1:28 PM

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right under the advanced motion setting

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do not manually change the current. Enable performance mode. I just confirmed mine drops do 0.8 like yours when its not in performance mode

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jumping on a call for work. be back in 30-45 mins

tidal mirage Mar 10, 2026, 1:31 PM

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Don’t see that. What I see is in the pics I sent

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Thanks for your patience and support. Very frustrating even Fabrico won’t help me

twin hinge Mar 10, 2026, 2:44 PM

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tidal mirage Don’t see that. What I see is in the pics I sent

Go into the configurator tab in RatOS, then Setup Wizard and then click hardware selection on the right side.

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then scroll down under electronics and enable advanced check box on motion and then enable performance mode as well.

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then you should see you your steppers with the tuned profile of 1.188 on current. Ignore my Y as I run an upgraded stepper on the Y so its more power. But you should see your X & Z the same as mine and I think you Y will be the same as your x and z as well.

tidal mirage Mar 10, 2026, 2:54 PM

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Well now I can’t communicate with mcu! Tried rebooting several times. Serial connection looks good.

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I’m not liking this new OS.

twin hinge Mar 10, 2026, 2:55 PM

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the bulk of RatOS 2.1 is the same. Its mostly some of the under the hood stuff. Its been flawless for me on three printers. For my v-core 4 its turned it into a new printer it works so well now. My two minions have been great though.

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is there a chance as you were going through the configurator you changed the mcu configuration on accident?

tidal mirage Mar 10, 2026, 2:58 PM

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Nope.

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I had issues like my pinda failing a year after purchasing and very noisy pcu. They sent me a lemon!

twin hinge Mar 10, 2026, 3:03 PM

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walk back through the entire configurator and have it regenerate the config files. As you get to that 2nd to last step make sure it is in performance mode

tidal mirage Mar 10, 2026, 3:04 PM

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Wlll do.

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You want me to go through this again?

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I’ve done this before about 3 times

twin hinge Mar 10, 2026, 3:08 PM

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if its flashed I think you can just pick manual by SD and it should detect things

tidal mirage Mar 10, 2026, 3:10 PM

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Not doing this again

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Too bad its a well built machine solid

twin hinge Mar 10, 2026, 3:14 PM

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how familar are you with linux if I walk you through some shell commands to see if it is even decting the board

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I do not think you need to flash it, something else is going on why its not being detected

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what happens if you just click the check board status button

tidal mirage Mar 10, 2026, 3:15 PM

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Tried that nothing happened

twin hinge Mar 10, 2026, 3:16 PM

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you know how to ssh into a linux host?

tidal mirage Mar 10, 2026, 3:17 PM

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Command line stuff I’m ok. Not expert at syntax. I always ssh into my rpi

twin hinge Mar 10, 2026, 3:17 PM

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ssh in and do an lsusb and see if you see your skr on there

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Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 1d50:614e OpenMoko, Inc. stm32g0b1xx
Bus 001 Device 006: ID 1d50:614e OpenMoko, Inc. stm32f072xb
Bus 001 Device 005: ID 04d8:e72b Microchip Technology, Inc. Beacon RevH
Bus 001 Device 003: ID 1a86:8091 QinHeng Electronics USB HUB
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub```

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its going to be the stm32 device. Mine shows two as I run a usb toolboard as well on my minion

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it just sounds like the USB connection is not working for some reason

tidal mirage Mar 10, 2026, 3:23 PM

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Oh no here we go again!
I bet id usb is wiped

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It’s there good

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Look at this. I have to reinsert proper path

twin hinge Mar 10, 2026, 3:35 PM

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it should do that automatically but if you do have to specify it put it in the printer.cfg. Ratos.cfg gets regenerated automatically

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printer.cfg you will get a warning before it writes over it

tidal mirage Mar 10, 2026, 3:36 PM

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It never does

twin hinge Mar 10, 2026, 3:36 PM

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is that your ratos file?

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when I had you go into the configurator one of those times looking at settings it mgiht have overwritten it

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just put the [mcu] header and the serial line in your printer.cfg in the area for user defined settings and it will override the ratos.cfg

tidal mirage Mar 10, 2026, 3:37 PM

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And it always puts it in RatOs.cfg

twin hinge Mar 10, 2026, 3:37 PM

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put that in printer.cfg

tidal mirage Mar 10, 2026, 3:38 PM

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Will do

twin hinge Mar 10, 2026, 3:38 PM

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so one of my minions is 230mm on Z and I can override that just but doing it like that. Same as the MCU setting you are trying to do

tidal mirage Mar 10, 2026, 3:39 PM

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Done that many times before.

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Did it again and still no connection

twin hinge Mar 10, 2026, 3:40 PM

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was it working in your ratos.cfg file though but not in printer.cfg?

tidal mirage Mar 10, 2026, 3:40 PM

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No

twin hinge Mar 10, 2026, 3:41 PM

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is at the top of your printer.cfg from the debug you uploaded earlier

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is that still there? I wonder if the id changed. if you remove the one you put in and change it back to the /dev/RatOS/btt-skr-2-429 does it work?

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or just remove that entire MCU section

tidal mirage Mar 10, 2026, 3:43 PM

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Did that.

twin hinge Mar 10, 2026, 3:43 PM

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it has to be below the ratos.cfg include or the ratos.cfg overwrites it

tidal mirage Mar 10, 2026, 3:49 PM

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I use this method but you’re not supposed too. It works

twin hinge Mar 10, 2026, 3:51 PM

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I am not sure why you are even having to do that as it should detect the skr2 429 fine. I have not used one of those for a while though as my original minion I upgraded to an SKR3 for auto firmware updated and my 2nd minion is an SKRat board

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so klipper sees the MCU now?

tidal mirage Mar 10, 2026, 3:52 PM

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Yes always with ttyACM0.

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Back to square one

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This is the kind of stuff I have to go through

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I pretty much know my CFG files and all that stuff

twin hinge Mar 10, 2026, 3:55 PM

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strange. ill ask one of the devs about the device id. Now can you put it in performance mode?

tidal mirage Mar 10, 2026, 3:56 PM

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It is

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W will try another print again see what happens

twin hinge Mar 10, 2026, 3:57 PM

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so its showing 1.118 current for X, y and Z now?

tidal mirage Mar 10, 2026, 3:58 PM

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Yes

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This is crazy. I have to reverse direction pin again.

twin hinge Mar 10, 2026, 4:04 PM

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one of those steps you might have hit overwrite printer.cfg. I always skip that when it comes up

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on major upgrades I'll look at what it shows is different but 99 out of 100 times there is nothing I want it to overwrite once I have the machine provisioned

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it might have wiped PID for bed and hotend as well. check to see if those are still in there

tidal mirage Mar 10, 2026, 4:06 PM

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No it gets changed regardless

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Can’t print have to reconfigure Z calibration and all that

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Will get back to you later
Thank you again

tidal mirage Mar 10, 2026, 4:32 PM

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Also when you make changes to your config files, you don’t save and config?
What do you do just save and no config?

twin hinge Mar 10, 2026, 4:50 PM

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I save the configation every time. Its just when I go back through the configurator and it wants to overwrite the printer.cfg I look at the diff it shows and 99 out of a 100 times I have ignore the changes as its taking out things like stepper direction changes, my led config, etc. Very very few times is there anything ever it wants to change in printer.cfg that I want to keep. If there is something I'll just copy those changes out, not let it overwrite printer.cfg and then put in the change I wanted to keep it recommended

tidal mirage Mar 10, 2026, 5:17 PM

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No luck

twin hinge Mar 10, 2026, 5:19 PM

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tidal mirage No luck

How are you seeing if its loosing height? How thick was that print supposed to have been?

tidal mirage Mar 10, 2026, 5:38 PM

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In slicer Z height is 7.92
From printer Z hire is about five

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Never mind those dimensions wrong cube

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I’ll print out the test one

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Meanwhile, this is the start print G code in my slicer
Does this look good?

tidal mirage Mar 10, 2026, 6:00 PM

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I have to go to work
Can we continue this later?
Thank you very much for your help

twin hinge Mar 10, 2026, 6:07 PM

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sorry working as well. Ping me later and we can see if we can figure it out

tidal mirage Mar 10, 2026, 6:32 PM

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You’re helping me a lot
Putting me on the right track and giving me some ideas
I noticed that it messes up on the final layers
Back to work

twin hinge Mar 10, 2026, 8:16 PM

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I am back from my lunch meeting but on calls. Let me know when you are back.

minor sierra Mar 10, 2026, 8:44 PM

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Just one thing to consider is that if you have an alu gantry, the heat from the hotend will cause the gantry to the bow down. To troubleshoot, you might want to physically change the direction of the toolhead fan so that it does not blow on the gantry. Do not leave it running like that, as it will reduce the life of the fan. Try it just to see whether it has any effect or not.

tidal mirage Mar 10, 2026, 8:55 PM

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Can I see your start_print G code from your slicer settings

twin hinge Mar 10, 2026, 9:36 PM

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tidal mirage Can I see your start_print G code from your slicer settings

I just use the standard RatOS documentation start code https://os.ratrig.com/docs/slicers

Slicer Configuration | RatOS

Prusa Slicer

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the start code on the website is long so make sure to select all or hit the copy button to make sure you do not miss some of it

tidal mirage Mar 10, 2026, 9:41 PM

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I did I do just wondering what you use if anything different

twin hinge Mar 10, 2026, 9:42 PM

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I run Orca. I hate the UI of Prusa but I am not currently using IDEX so its fine to run Orca

tidal mirage Mar 10, 2026, 10:27 PM

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Funny, you should mention that I’m learning it
Right now I’m calling at the day. I am tired.
And again, thanks for your help. I’ll ping you later.

tidal mirage Mar 11, 2026, 12:18 PM

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Hi good morning
I think the software end is good now
I think this is a hardware issue
Down the road soon, I’m gonna open it up check wire, and all that stuff
I think I might’ve done something when I put the super Pinda in
I will keep you posted. Thank you very much.

austere sparrow Mar 12, 2026, 10:50 PM

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For sure this is actually a z height issue and not uncalibrated rotation_distance? I've only seen two pics and they're both from the top, not elevation...

#Z height losing very small increments in height for each layerRatOS v2.1.0 - RC4 (bullseye)Update