Acceleration or jerk bounds for heavy prints?
I've had my i3 MK3S for a couple of months now and it's behaved flawlessly. Love it.
However, I have a large structural part to print with high infill (40%+) that's going to end up weighing almost 500g. I've heard elsewhere that "bed slinger" printer designs like the i3 can suffer from missed steps when printing very heavy objects because y-axis movements have to move the whole weight of the part as well as the bed. Is this likely with the i3? If so, any tips on maximum acceleration or jerk settings for heavy parts? I'm keen not to waste almost half a reel of filament on a failed part!
Cheers
Andy
Best Answer by JoanTabb:
I printed a huge moneybox which took over 1KG filament without changing jerk or acceleration
you should not need to worry about this. regards Joan
RE: Acceleration or jerk bounds for heavy prints?
1g is roughly 9800 mm/s^2. Typical limits in the slicer are about 1000 mm/s^2 or about 0.1g. Decreasing the limit to 500 mm/s^2 would halve the force on the print. At 250 mm/s^2 there's only about 0.025g of acceleration, which is less that a 2deg tilt of the baseplate relative to local gravity.
RE: Acceleration or jerk bounds for heavy prints?
I printed a huge moneybox which took over 1KG filament without changing jerk or acceleration
you should not need to worry about this. regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: Acceleration or jerk bounds for heavy prints?
Thanks! That's good enough for me. I'll press 'go' at the weekend I reckon. Fingers crossed!
Andy
RE:
I know this is an old thread, but I figured I'd ask my question here instead of starting a new one.
I printed a huge moneybox which took over 1KG filament without changing jerk or acceleration
you should not need to worry about this. regards Joan
I am about to embark on a 2-day print job for a heavy object that reaches the maximum height of the MK3S build volume. This print job will consume a whole 1 kg spool of PLA.
My main concern is that with enough mass slinging back and forth, the part will separate from the build plate.
I have a textured PEI sheet, on which I print PLA. The sheet has had adhesion issues since new, but after 3 years it seems to be getting broken in, sort of like a cast iron kitchen skillet. I have abraded the surface with coarse steel wool (not that you can tell by looking at it, but it did improve adhesion), and I also wash the sheet in warm water and dish soap because I have found 99% isopropyl alcohol to be ineffective.
This is one of those situations where Murphy's Law would require that the print must fail when it is nearly complete, because that's when there is the most mass moving back and forth.
It guess I could adjust the Y-axis machine limits in PrusaSlicer.
It would also be nice if the slicer kept track of the mass already on the build plate and adjusted acceleration as the mass increases. Does anyone know if this already happens?