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Hello,
I just joined the forum since I'm making good progress with my PRINTNC project. I want to use 4 closed loop step motors (2 steppers for z axis). I keep look around but everyone is using a MESA boards or a raspberry pis with some kind of adapter boards for connecting the stepper drivers.

  I live in Turkey and I can't get anything through customs that's over 30 Euros I can't get the MESAs or the adapter boards for raspberry pis (No shipping to Turkey). BUT I have access to 3D printer control boards. like BTT Manta M8P and MKS SKIPR V1 or MKS Tinybee. Is something possible with these?

I would be very glad if you can point me in some direction. Thank you.

What are the chances of this being a slow SD card issue?
It sure points that way...

To tell the truth, whilst I haven't done any long term testing, I haven't seen this issue of my RPi-400.
When I build the image I put it through the basic tasks, and if I had of seen this issue arise I wouldn't have released the image, I would have deemed it defective and not fit for purpose.
Now we are going to require some more info, what monitor (brand model) screen resolution and such. And just to be sure I would like to know if this is a clean install without any extras added. If you can remember when was the last time you did an update.

And yes the RPi400 should give reasonable playback on youtube and reading pdfs shouldn't pose an issue. When I get the time I'll recheck things but as I said before I haven't seen this issue arise during testing and so far in the 6 months it has been out in the wild no one else has mentioned this.

One thing I would suggest is look at this thread, forum.linuxcnc.org/38-general-linuxcnc-q...l-images-only#325007 and take note of the video issue link & zswap link.