XY-Axis Stuttering
My MK3S+ is quite old (>900 days of printing time) but beside some wear out parts I never had issues with it.
Since 2-3 days on the sudden two errors appeared ... which look like they are completely independet ... and they might be ... but also maybe not ...
1.) I get frequent errors on the print fan ... The fan was quite old and already slightly noisy, so I replaced it with the new fan I keep on stock (never changed the Heatsink fan, but the print fan was broken several times already). But the problem didn't go away. It still might be the cable since I only soldered the fan to the existing wire, but wiggeling the cable from fan to the electronics housing didn't trigger the error ... I was present twice when the problem occured .. The fan was running normally though ... so I disabled fan check for the time beeing.
2.) At the same time my x- AND y-axis start to stutter ... only when the print head is moving fast from one location to another (see the video). The printer otherwise is printing quite normal. And yes, as far as I can understand from the movement both axis are doing the same. The effect appears when mainly moving Y or X ...
Z-axis is diffucult to judge in the moment since during printing it is not moving fast.
What did I check already:
- lubricated the axis (usually do from time to time) and for my feeling they move quite smooth ...
- Checking the 24V power supply ... at least with a multimeter it looks rock solid. Didn't check with an oszilloscope yet
- Checked the gcode to make sure there are no strange "speed changes" during movements, for whatever reason ...
- Firmware is the latest one (3.12.2)
The MK4 is ordered already and should appear within the next 2-3 weeks ... but I want my MK3 up and running as well.
Did somebody have a similar issue already?
Are there any ideas what might be wrong (Internal board voltage supply? Bad motor drivers? ...)
I don't want to buy a replacement board just to figure out that the problel is something else
- Made by me -
XY-Axis Stuttering (Video Link)
Sorry ... I tried several ways but it looks like I am too stupid to embedd my video ...
Here is a direct link:
https://forum.prusa3d.com/wp-content/uploads/2023/05/MK3Sp_XY-Stutter.mp4
- Made by me -
RE: XY-Axis Stuttering
I had this but when doing calabration in then end it was bad einsy it came down to does the lcd flicker
Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models
RE: XY-Axis Stuttering
No, LCD is not flickering when in operation ... It does flicker nevertheless when moving the axis while powered of ... But I assume that's just the "normal" induction of the motors that powers back through the FET stage in the motor drivers. At least I've seen this with other printers as well.
I am also kind of afraid that it is the main board since the power supply appears to be stable.
The current print is running for another few days ... but for test and measurements it might be a good idea to create some Gcode which just moves the axes independet and combined ... That should make it easier to figure out which axis are affected. Maybe I am able to trace something down in the schematic then.
- Made by me -
RE: XY-Axis Stuttering
Do first layer calabration and when it's homing itself see if it stutters and when you start a print see if it stutters when homing can you video stutters please I would say it's bad motherboard einsy but video will help
Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models
RE: XY-Axis Stuttering
Do you mean a video of the stuttering especially when homing or movements during printing.
For the "printing stuttering" I have a video (not embedded, didn't work for me, but there is a link in my second post) ....
When the current print is finished, I will try and record when homing.
- Made by me -
RE: XY-Axis Stuttering
Your other video was to jumpy and hard to see the stutter one of homing would be good
Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models
RE: XY-Axis Stuttering
Also what color is your psu
Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models
RE: XY-Axis Stuttering
Forget post about PSU I can see it's black in other video
Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models
RE: XY-Axis Stuttering
You hardly can see the stuttering ... it mainly is recognizable in the audio ... it also is barely visible with the naked eye.
I will definetely make a video for homing ... but it is moving quite slow there. So I don't know whether it appears there. During printing it also only is recognizable during the fast movemets of repositioning ... during the actual print moves it seems to be as smooth as it is supposed to be. I also can't see degradation in print quality (yet).
It is not objective ... but it appears to me that the stuttering is increasing over time ... but I am not sure ... just might be a subjective impression.
What also comes to my mind, but I didn't put too much weight into it:
When doing the calibration steps, it already twice required a Z-Axis calibration. For the first time I did a nozze swap, so it might have happened that I missplaced one of the Z-sides. But the second time I didn't do anything except start a new print ... So this also appears strange.
- Made by me -
RE: XY-Axis Stuttering
I have the same issues with stutter like I said above support told me faulty mai board I never replaced it as too expensive that's why I'm trying to help you to help me as well the Z axis will drop over time it's normal
Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models
RE: XY-Axis Stuttering
The screws on the z axis printed parts may need replacing if it keeps recalibrating z axis
Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models
RE: XY-Axis Stuttering
Your x axis or y axis hard to tell motor doesn't sound to good
Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models
RE: XY-Axis Stuttering
Yes ... I understand ...
I will make another video with homing and I designed a test print to maximise movements with isolated X- and Y- Axis.
But I only can do so tomorrow evening since the current print is still taking >24h ... So tomorrow after Work I will make some additional tests and post some updates 🙂
I appreciate your hints.
- Made by me -
RE: XY-Axis Stuttering
All good 🙂 I really hope you find an answer can you tell me are you In normal or stealth mode
Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models
RE: XY-Axis Stuttering
Just normal mode ... I never use stealth mode ... The difference in noise is not so significant. And I am lucky that I have a good place for the printer where silence is not crutial.
- Made by me -
RE: XY-Axis Stuttering
When you do homing video please do one of stealth mode and one of normal mode
Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models
RE: XY-Axis Stuttering
Ok .. I spent almost two hours now ... But I am not really getting anywhere.
In "Stealth" Mode I didn't observe any stuttering. It only appears in normal mode ... and also only when both axis are moving fast. In homing it is moving quite slow ... so no stuttering there at all. Neither in Stealth mode nor in normal mode.
It becomes more and more strange ... I created another video ... but it doesn't show anything more than the one I postet already. So I will skip the processing and posting. Stealth mode is perfectly fine ...
What did I do:
- Measure the 24V with an Oszilloscope ... apx. 100mVpp ripple (also during stuttering ... nothing changed there at all) ... looks ok to me for a 200W Switching PSU
- Measure the internal 5V ... apx. 20mVpp ripple ... looks ok.
- Checking the smoothness of the X- and Y-axis ... the bearings are worn out slightly, but they still glide smoothly across the rods. The right bearing on the Y-Axis is rattling a little bit. This makes the resonant vibration noises in the video (this is not caused by the motors themselfes). Nevertheless ... it still glides smoothly.
- I checked the cable for the print fan whichs throws an error from time to time ... didn't recognize any cable breaks. Connection is quite reliable ... Fan is completely new since I first expected the fan to be the guilty one.
- Checked the nuts on the Z-Axis ... they have plenty of time on them .. but always were either teflon or silicon grease lubricated. At leaset they don't wiggle much. Actually the axis of the motor gives more than the nut for moving the Z-axis ...
- Attached an external 1000W regulated lab power supply (Gossen Metrawatt) just to be sure ... no change ... same stuttering
What are my actual issues with the printer ... just to recap ...
- Stuttering of the X- and Y-Axis, if both are moving fast
- Unpredictable print fan errors, even when the fan is moving freely and the signaling doesn't show any obvious contact issues from fan to connector.
- Increasing number of Z-Bed leveling erros with forced Z-axis calibration. (this always happens at the fith point (bed center) ...) Since it always is the same position I might have missaligned the bed when moving the printer .. but no visible warping with an checking with a steel ruler. I think I have to go to town and reallign the bed with µm shims again, just to be sure. (yes, I know there is the selfsecuring nut thingy ... but the shims worked out for me quite well.)
I checked the schematic of the board .. but didn't find many things in common for those issues. Leave alone the 5V supply (driver logic, fan, PINDA, ...). But the 5V supply doesn't show any breakdowns or even increased ripple when the stuttering or calibration errors occur.
The other subject might be the µC itself ... but I doubt on that.
What puzzles me is the fact, that even with stuttering of the main axis I don't lose positions ... the print quality is perfectly fine for a printer with almost 1000 days of print time 🙂 ...
But turning off fan control and the stuttering is not an long run option for me ...
I ordered a replacemant board and then I will see, whether the problem is gone ... when it persists I still have a relplacement board for later on ... If not, then it becomes more tricky ...
I will keep you up to date ...
PS: Maybe I will try a factory reset and reflashing the firmware ... just in case there is some bitflip in the calibration data or firmware ...
- Made by me -
RE: XY-Axis Stuttering
So stealth mode usesLess power so its something with power Wich is also why you're probably getting fan errors and possibly false reading from the pinda causing z axis resetting so not sure if that helps contact support about fan Incase it's faulty they might send another one otherwise just run until new board comes and please keep me updated
Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models