What could cause this kind of artefacts on surface?

Arminas

Hello. Could these artifacts be related to chineese stepper motors? pitch of artifacts are less than 1 mm, maybe 0.5 mm.

tas

@Arminas These look like Very Fine Artifacts (VFA's). That is the magic name to search for in the forum.

Lots of work has been done on this. Personally I think it is the steppers. I have Creality printers with Duet2Wifi controllers powered by Meanwell power supplies.

I changed every single component but the frames trying to solve this. I changed pulleys, belts, bearings, wheels and wheel bearings. Changed all multiple times with no effect. All are Gates or OpenBuilds now. I changed hotends several times and extruders as well with no real change noticed. Now using Bondtech LGX Pro Lite with Revo6. Prior to that it was Hemera with Volcano.

After you spend enough money on a problem you start to see very minor improvements in print quality but that may be from looking through tears in my eyes.

I finally changed all steppers for E3D units and the VFAs are completely gone.

I have kept up the Duet firmware and DWC versions to the latest. It is possible that that has had an effect. If so, don't tell me, I don't want to know!

droftarts

@Arminas See this thread, and the thread linked from it: https://forum.duet3d.com/topic/33208/help-appreciated
I posted links to a set of videos on VFAs, and whether they are linked to the motion system or extrusion. Printing a tapered object should show if it is one or other of these. However, yours does look like motor-related VFAs.

Ian

Arminas

@droftarts I assume LDO motors are quite good, I will give it a try and see how it works. Current motors are nema23, but electronics board is Duet2. As I understand, Duet2 does not give enough current for nema23 motors, so these motors are overkill in terms of the overall electronic system? Is it safe to use 2.4A for drivers on Duet2?

o_lampe

@Arminas said in What could cause this kind of artefacts on surface?:

Is it safe to use 2.4A for drivers on Duet2?

I've used 6-wire NEMA23 with Duet2. I wired them to have the highest torque and it was no problem with Duet2.
A little cooling fan for the back of the board won't hurt.