Slic3r v1.2.9 over-extrusion issues Just a heads up for all those who are using slic3r 1.2.9 (by default installed with the latest version of Repetier Host). Basically it over-extrudes when slicing thin walls like 1 to 2mm. The gap infill extrudes too much filament in many cases giving some artifacts that's visible on the outside and causing a buildup of filament making a mess of the top infill. I've seen more reports from users that have this issue on this forum. Hopefully the issue will be resolved soon! See this github issue: Slic3r github I'm using 1.2.7 which seems to be good and stable enough for me. Some would rather use 1.1.7. You can use the slicer manager in repetier host to add other versions to try and see what works for you. Cheers! Imqqmi https://reprap.org/forum/read.php?1,562959,562959#msg-562959 Sat, 12 Sep 2026 07:15:39 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,562959,771333#msg-771333 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,771333#msg-771333
I can report that the over extrusion is fixed in this version, the speed of slicing is a lot faster and it seems the support structures have also changed from those pillars that sometimes collapse during printing to a more robust honey comb structure. It also seems to detach easier, especially with PETG I've been printing lately. I like PETG a lot and is fast becoming my go to filament. It's strong, doesn't warp a lot, is easy to print overall and layer adhesion is almost as strong as along the layer axis. It sticks well on the varnish I use on glass and releases reasonably easily when cooled.

Anyway, more testing is needed but so far it seems very stable, slices nicely and prints come out great.

I haven't tested any new features yet though.]]> imqqmi General Thu, 01 Jun 2017 18:39:50 -0400 https://reprap.org/forum/read.php?1,562959,771316#msg-771316 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,771316#msg-771316 paul12 General Thu, 01 Jun 2017 17:03:04 -0400 https://reprap.org/forum/read.php?1,562959,709857#msg-709857 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,709857#msg-709857
Quote
pmaier
Thanks for this guys. I had installed the newest Repetier (1.0.2) and it kept clogging and stripping my hotend/extruder. I figured out it was the gap fill that was causing it. Set the speed for gap fill to 0 (disables it) and prints were working albeit without the gap fill. Installed Slic3r 1.2.7 as mentioned here and it's back to printing pretty :)-D.

If your extruder is stripping filament due to a clog (in this case, back pressure due to over extrusion), the pinch wheel tension is too low. The motor should slip rather than chewing a divot into the filament. Tighten up the screws to push the filament harder against the drive gear.]]> the_digital_dentist General Sun, 25 Sep 2016 22:09:02 -0400 https://reprap.org/forum/read.php?1,562959,709854#msg-709854 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,709854#msg-709854
p.s. I hate workarounds, but sometimes there is no choice.]]> etfrench General Sun, 25 Sep 2016 21:17:50 -0400 https://reprap.org/forum/read.php?1,562959,709848#msg-709848 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,709848#msg-709848 pmaier General Sun, 25 Sep 2016 19:26:50 -0400 https://reprap.org/forum/read.php?1,562959,647639#msg-647639 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,647639#msg-647639 github.com]. The dev branch doesn't seem to be working well (as of about a week ago), but stable seems to be quite good (currently 1.2.10-dev)]]> JamesK General Sat, 02 Apr 2016 17:21:24 -0400 https://reprap.org/forum/read.php?1,562959,647590#msg-647590 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,647590#msg-647590 Rolling back to 1.2.6...

I know this thread is old, but I was just fighting with this myself, and I think I've figured out why 1.2.9 behaves this way.

There's a new setting, under Advanced, called Overlap.
It creates an overlap between infill and perimeters for better bonding, and it's set to 15% by default.

I turned that down to 0, re-sliced, and got an output that looks a lot more like 1.2.6.

This would tend to be a problem when doing intricate prints with a high surface-to-infill ratio. And it explains why all of the miniatures I've been trying to print for the last few months have been failing! On the plus side, my printer got a LOT of upgrades as I tried to get reasonable outputs. 8-)]]> maso General Sat, 02 Apr 2016 14:12:17 -0400 https://reprap.org/forum/read.php?1,562959,571661#msg-571661 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,571661#msg-571661
Quote
e270889o
I will try 1.2.6 then

Improvements from 1.1.7 worth change?

Not sure what changes there were from 1.1.7 to 1.2.9. 1.2.6 was the version I was using before 1.2.9 and had been getting good results from it.]]> ElmoC General Fri, 16 Oct 2015 21:11:18 -0400 https://reprap.org/forum/read.php?1,562959,571660#msg-571660 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,571660#msg-571660 animoose General Fri, 16 Oct 2015 21:05:57 -0400 https://reprap.org/forum/read.php?1,562959,571643#msg-571643 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,571643#msg-571643
Improvements from 1.1.7 worth change?]]> e270889o General Fri, 16 Oct 2015 19:20:29 -0400 https://reprap.org/forum/read.php?1,562959,571630#msg-571630 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,571630#msg-571630
Quote
e270889o
Totally perfect with 1.1.7

I printed it from SD card, so i have not tryed 1.2.9 from SD card, but, im tired of testing, so i will keep with Slic3r 1.1.7 and remote printing from the SD card.
]]> ElmoC General Fri, 16 Oct 2015 18:21:30 -0400 https://reprap.org/forum/read.php?1,562959,571622#msg-571622 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,571622#msg-571622
I printed it from SD card, so i have not tryed 1.2.9 from SD card, but, im tired of testing, so i will keep with Slic3r 1.1.7 and remote printing from the SD card.]]> e270889o General Fri, 16 Oct 2015 18:01:15 -0400 https://reprap.org/forum/read.php?1,562959,571551#msg-571551 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,571551#msg-571551
Nozzle literaly swimming into small parts.

Im gonna try 1.1.7, and come back for report.

Thanks]]> e270889o General Fri, 16 Oct 2015 15:55:55 -0400 https://reprap.org/forum/read.php?1,562959,564380#msg-564380 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,564380#msg-564380 elwood127 General Wed, 30 Sep 2015 01:27:09 -0400 https://reprap.org/forum/read.php?1,562959,563463#msg-563463 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,563463#msg-563463
I ran into this exact problem. It kept jaming my head/stripping the filament on an unusually thin wall object.

I'll try an older slic3r.]]> Komb' General Sun, 27 Sep 2015 22:35:03 -0400 https://reprap.org/forum/read.php?1,562959,563226#msg-563226 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,563226#msg-563226
Gap infill is the infill that's too small to use a rectilinear or honeycomb pattern, it should calculate the gap width and adjust the extrusion width to it to fill the gap. 1.2.9 fills this gap with a default width regardless of the actual gap width which over extrudes in most cases.]]> imqqmi General Sun, 27 Sep 2015 08:50:52 -0400 https://reprap.org/forum/read.php?1,562959,563101#msg-563101 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,563101#msg-563101 But I also had gapping top infill when I print solid parts and tick all the fancy boxes like:
Combine infill every X layers
Solid infill every X layers

I thought it was my inexperience with slic3r.....
-Olaf]]> o_lampe General Sun, 27 Sep 2015 02:12:17 -0400 https://reprap.org/forum/read.php?1,562959,563024#msg-563024 Re: Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,563024#msg-563024
I crashed my 3D printed quadcopter the other day, and one of the arms snapped between perimeters, which i've never seen before (they usually cleanly snap straight across).
[attachment 62956 IMG_20150925_180658.jpg]]]> AlexY General Sat, 26 Sep 2015 16:30:01 -0400 https://reprap.org/forum/read.php?1,562959,562959#msg-562959 Slic3r v1.2.9 over-extrusion issues https://reprap.org/forum/read.php?1,562959,562959#msg-562959
I've seen more reports from users that have this issue on this forum. Hopefully the issue will be resolved soon!

See this github issue:
Slic3r github

I'm using 1.2.7 which seems to be good and stable enough for me. Some would rather use 1.1.7. You can use the slicer manager in repetier host to add other versions to try and see what works for you.

Cheers!
Imqqmi]]> imqqmi General Sat, 26 Sep 2015 12:52:54 -0400