@Phaedrux @engikeneer
I set the jerk and accel values as recommended by @engikeneer and this almost completely got rid of the ringing/ghosting. There is still a slight hint of it visible but it got a lot better. The slicer now also shows the correct time, which is only off by a minute or two at most for small prints.
Thanks everyone for the advice!
@engikeneer
Thank you very much for this amazing thorough answer! I'll check all the screws again but I don't think they're the issue here.
Just for context, so people can see where I'm coming from:
While assembling the printer, I was afraid of tightening the belts too much so the first test cube turned out like this:
After that I went and thightened the belts by a lot more and managed to eliminate the Y-axis but not the X-axis ringing:
Then I thought, maybe I overtightened the belts on the X-axis so I loosened them by a little bit, but that didn't help at all.
I'm thinking that I maybe need to bolt my printer down somehow, or to set the jerk/accel values, which is why made this post.
I'll follow your advice and also try out the 'Dynamic Acceleration Adjustment', I've seen it in a couple of other posts but wasn't quite sure about, thinking that the manufacturers config file was already enough.
One couple of last questions though:
The units in the config file for speed and acceleration are listed as mm/min and mm/s^2. I understand that this is due to the RepRap GCode flavor, which differs from Marlin. Cura also uses mm/s^2 for acceleration, so no difference here except for speed/jerk (mm/s). I guess I need to divide the speed/jerk values from the config by 60 before inputting them into Cura, correct?
I also tried to use the PrusaSlicer at first but noticed that I can't set the machine limits for my printer when using the RepRap GCode flavor. The machine limits only appear in the settings when using Marlin. I know the commands are different but maybe it's possible to set the GCode flavor to Marlin and then work around that? Do I need to set some values differently and if so which and how? I read in some other post, that the reason why PrusaSlicer doesn't have machine limits for RepRap is because RepRap doesn't support the necessary GCode commands, is that true? This is one of the many things that confused me when researching this problem.
Hi, I recently bought a Modix Big-40 that has a Duet3D board.
Here are the specs from the WebControl:
Board: Duet WiFi 1.02 or later
Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 2.05.1 (2020-02-09b1)
I'm having issues with ringing/ghosting in my test prints. I tried tightening the belts, I tried loosening them, nothing made a real difference. I read that I could try enabling the jerk/acceleration control in the Cura slicer but I'm lost on how to set the values.
The manufacturer has a short tutorial on how to setup the printer in Cura, but that tutorial doesn't say, that I should change the GCode flavor from the default Marlin to RepRap. Which is the first thing that confused me, since this is a RepRap printer?
The second thing are the jerk/accel values. The printer has a config file that has some max values already set:
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X100.00 Y100.00 Z2000.00 E418.500 ; Set steps per mm
M566 X240 Y360 Z30.00 E120.00 P1 ; Set maximum instantaneous speed changes (mm/min)
M203 X9000.00 Y9000.00 Z360.00 E1200.00 ; Set maximum speeds (mm/min)
M201 X1000.00 Y1000.00 Z120.00 E250.00 ; Set accelerations (mm/s^2)
M204 P500 T1000 ; Set print and travel accelerations (mm/s^2)
M906 X1800.00 Y1800.00 Z1800.00 E1000.00 I40 ; Set motor currents (mA) and motor idle factor in per cent
M84 S60 X Y E0 ; Set idle timeout - one minute
What GCode flavor should I use in Cura? What jerk/accel values should I set? Will that even make any difference, since the config already has some values? I also noticed that the printing time is always significantly longer than what the slicer estimates.
I'm absolutely new to all of this, so I would greatly appreciate any help and advice on this matter.