Hi, I am getting some periodic patterns on mu outer shell. I think it is about extrusion because its phase changes although period doesn't by layers. It is like over-extruding every X millimeter of filament. Here is a picture:


Any ideas?

Edited 1 time(s). Last edit at 06/21/2017 09:33AM by trgtylcnky.

Ungeared extruders do that, even with 16:1 ustepping. You can play with the extruder current to tweak the way it looks, but it won't go away completely unless you use a geared extruder which increases the "resolution" of the extrusion process.

You may have a bit of over-extrusion going on, too.

Edited 1 time(s). Last edit at 06/21/2017 10:17AM by the_digital_dentist.

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Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]

I only have direct drive extruders on my printers and have never seen a pattern like that.
Are you sure your drive gear is clean and "round"? I've had chinese drive gears that weren't cut evenly. As a result the filament slipped a bit on every turn.

I have the same problem also. I tried changing;

• the Smoothie board with new one (new drivers)
• Extruder motor
• Dampers on X and Y motors
• the Smoothie stepping from 1/32 to 1/16
• printing speed (low speed)

However, the problem is continues!

Edited 2 time(s). Last edit at 06/27/2017 06:15AM by cagtag.