- Nino NobileParticipantAugust 25, 2016 at 3:58 pmPost count: 11
Hi all, I attached a picture of the problem I’m having to print , the corners go wrong !! I think the squaring is well, attached a picture of this too . I tested with all possible configurations , printing fast , slow, with different layer heights , etc. My MPCNC is really great with a volume of 1000x500x330 mm impression and I’m using a nozle of 1 mm.
Thank you very much!!
- This topic was modified 1 month, 3 weeks ago by Nino Nobile.
Attachments:vicious1KeymasterAugust 25, 2016 at 4:04 pmPost count: 2642
How fast are you printing? Your machine is extremely tall on the z axis you need to print slow at that length, the accelerations will cause wobbles everywhere. You might want to double check your z axis threaded rod to see if it is bent as well.
Nino NobileParticipantAugust 25, 2016 at 7:17 pmPost count: 11
- This reply was modified 1 month, 3 weeks ago by vicious1.
Im printing to 2200 mm/min and 200mm/s3, is not the threaded rod , I just verify. 🙁vicious1KeymasterAugust 25, 2016 at 8:31 pmPost count: 2642
Do you need it to have that much z length?
So that is about 36mm/s, Try half that and see if your prints improve drastically. At that speed you are whipping the head around and it is probably causing your issues. Or you could raise up your work surface.
Are you using my firmware or your own, I ask because of the acceleration settings?vicious1KeymasterAugust 25, 2016 at 8:34 pmPost count: 2642
Just as a reference point on all my dedicated 3d printers, prusa style, non-bowden. I print ant 30mm/s with minimal acceleration wobbles/artifacts on my prints. Looks like your print head is hanging about 12 inches out. For every half the distance your z is hanging your machine will be 2 times as rigid, every mm counts.Nino NobileParticipantAugust 26, 2016 at 6:59 amPost count: 11
I understand , I’m using your firmware , with an acceleration of 200 , I tried it with the speed that suggested to me and improved considerably.
What would be the right height for printing at a speed of 35-40 mm / s ?
thanks for your help!vicious1KeymasterAugust 26, 2016 at 7:23 amPost count: 2642
Thats just it, I never print that fast, even on a dedicated machine. Do you have a need for such a big z axis? I have 8 printers and have been at this for many years and even at a design job always needing prototypes I never printed anything taller that 6″.
If you accelerate too fast you will get ringing, to slow and you will get soft corners. The acceleration I had set in the firmware (200) was the slowest I could go before getting bad prints at 25-30mm/s.
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