Trying to figure out this zits or holes - Assembly and first prints troubleshooting https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/ Prusa3D Forum Discussion Board en-US Fri, 12 Jun 2026 02:10:54 +0000 wpForo 60 RE: Ich versuche, diese Pickel oder Löcher herauszufinden https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-420538 Tue, 20 Apr 2021 19:17:54 +0000 @sid-2

Ok it's interesting to know, I know that the Prusa MINI uses 3.2mm by default, but it just didn't work because I can only use 1.4mm with no problem, but that the problem is also with the standard Prusa extruder occurs is strange because it can't be due to the hotend, because I also use the same setting when converting to V6.

]]> Assembly and first prints troubleshooting Daniel https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-420538 RE: Trying to figure out this zits or holes https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-420529 Tue, 20 Apr 2021 19:08:12 +0000 In my default prusa mini profile the retraction is 3.2mm. I'm using the default extruder on the Prusa Mini

]]> Assembly and first prints troubleshooting Sid https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-420529 RE: Ich versuche, diese Pickel oder Löcher herauszufinden https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-420517 Tue, 20 Apr 2021 18:49:37 +0000 @sid-2

That's the problem, the retraction was too high, I have 1.4mm for PLA, do you happen to own a Bondtech extruder?
And the retraction is standard for me, no matter what brand, with PETG I have 1.6mm

]]> Assembly and first prints troubleshooting Daniel https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-420517 RE: Trying to figure out this zits or holes https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-419224 Mon, 19 Apr 2021 07:36:11 +0000 This problem is solved. I've changed the default retraction from 3.2mm to 1.5 and prints are perfect now. All the other settings are the same. I'm using eSun PLA+ filament. I would be nice though if someone could explain why the zits are in a different location then where the retractions are. This is still a mystery to me, the only thing I could think of is because there is air sucked into the nozzle at the retraction.

 

Left: 1.5mm rectraction                                                                        Right 3.2mm retraction

 

 

 

]]> Assembly and first prints troubleshooting Sid https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-419224 RE: Trying to figure out this zits or holes https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-417109 Thu, 15 Apr 2021 22:07:33 +0000 It might be a slight underextrusion, but first I would try printing a few degrees hotter.  Also, slowing the perimeter print speed might be gentler on the filament.

Cheerio,

]]> Assembly and first prints troubleshooting Diem https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-417109 RE: Trying to figure out this zits or holes https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-417022 Thu, 15 Apr 2021 19:00:30 +0000 Same print, but now with retraction configured as 2.5mm. There's definitely improvement visible. I'm wondering how much retraction other people use.

 

]]> Assembly and first prints troubleshooting Sid https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-417022 RE: Trying to figure out this zits or holes https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-417013 Thu, 15 Apr 2021 18:31:02 +0000 Another test with a smaller print. This is the back of the print, seam is configured as aligned.

 

]]> Assembly and first prints troubleshooting Sid https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-417013 RE: Trying to figure out this zits or holes https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-416974 Thu, 15 Apr 2021 16:45:04 +0000 I've been listening a little bit better and there are plopping noises. I've moved the role of filament to my MK3s and there you can't hear the noise. 

On the Mini there seems to be regularity. After a retraction it takes about 2 seconds and then two pops come shortly after each other. So it looks like it has something to do with the retraction. It may sound strange, but could air be sucked into the nozzle?retraction settings are default.

Length: 3.2mm
Lift Z: 0.2mm

]]> Assembly and first prints troubleshooting Sid https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-416974 RE: Trying to figure out this zits or holes https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-416878 Thu, 15 Apr 2021 13:18:36 +0000 If it would be filament the zits wouldn't be at the same positions everything, I think. Don't hear any strange noises coming from the extruder

I've uploaded an 3mf file; https://easyupload.io/wcpmsj

 

]]> Assembly and first prints troubleshooting Sid https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-416878 RE: Trying to figure out this zits or holes https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-416872 Thu, 15 Apr 2021 12:56:23 +0000 Interesting.  I originally suspected damp filament which is why I suggested the switch.

Do you hear any noises from the extruder/nozzle when printing?

Gcode is rarely much help.  Please zip a 3mf file (save project from slicer), it will contain the settings we need to diagnose this.

]]> Assembly and first prints troubleshooting Diem https://forum.prusa3d.com/forum/assembly-and-first-prints-troubleshooting/trying-to-figure-out-this-zits-or-holes/#post-416872