Thin walls won't get infill I have often that a thin wall will only print both outer perimeters, but not the infill. So I will get a 2 lines outer side, a 2 lines inner side and between a space of approx 1 or 2 layer thickness. My infill is default honeycomb. Is the space between the walls to smaal to put a honeycomb in ? Can I change this ? Thomas https://reprap.org/forum/read.php?263,871562,871562#msg-871562 Sat, 08 Aug 2026 18:47:02 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?263,871562,881890#msg-881890 Re: Thin walls won't get infill https://reprap.org/forum/read.php?263,871562,881890#msg-881890
Quote
the_digital_dentist
Honeycomb (and 3D honeycomb, gyroid, etc.) infill is primarily for marketing photos of 3D printers or for the occasional print where the infill will be visible by intention.
I must disagree with that assertion with respect to gyroid. I find gyroid to be fast to print, has the advantage of no crossing lines, and creates a high-strength part in all directions unlike 2D infill patterns like triangles, grids, or stars.

That said, I have also noticed the same thing as the OP: a thin wall may be thick enough for one or two perimeters but leaves a hollow space in between. The "detect thin walls" setting has never given me any satisfactory results, especially when my part involves sharp edges. It's really best if there's a thin wall connecting two other larger areas of the part. With a sharp vertical edge, "detect thin walls" usually creates a floating edge separated from the main part by a small gap. Because of that, some time ago I proposed a slicer modification for vertical sharp edges in the Prusa forum, but I was a newbie then and didn't know that a slicer forum might be a better place to propose it.]]> anachronist Slic3r Wed, 24 Feb 2021 17:55:54 -0500 https://reprap.org/forum/read.php?263,871562,879716#msg-879716 Re: Thin walls won't get infill https://reprap.org/forum/read.php?263,871562,879716#msg-879716 whosrdaddy Slic3r Sat, 19 Dec 2020 13:00:17 -0500 https://reprap.org/forum/read.php?263,871562,871590#msg-871590 Re: Thin walls won't get infill https://reprap.org/forum/read.php?263,871562,871590#msg-871590 the_digital_dentist Slic3r Mon, 27 Apr 2020 13:09:44 -0400 https://reprap.org/forum/read.php?263,871562,871583#msg-871583 Re: Thin walls won't get infill https://reprap.org/forum/read.php?263,871562,871583#msg-871583 helpful tips,

however this does not explain why the infill does not start.
See picture of my print ...



Both long sides have empty space where infill should be...

Thomas
]]> Replace Slic3r Mon, 27 Apr 2020 12:31:27 -0400 https://reprap.org/forum/read.php?263,871562,871571#msg-871571 Re: Thin walls won't get infill https://reprap.org/forum/read.php?263,871562,871571#msg-871571
All motion in the printer is subject to acceleration and deceleration. When printing long straight lines the extruder accelerates to the specified print speed, and then, before the end of the segment, it decelerates down to the jerk speed. In short segments, the extruder starts to accelerate, but it quickly has to decelerate because it is approaching the end of the line.
Honeycomb infill consists of a bunch of short segments in which the direction keeps changing. That means it is slow to print because of the short segments, and that it shakes the hell out of the printer because the direction keeps changing. It is probably no stronger than any other infill.

If you want your prints to be strong and finish quickly, you want to use infill that consists of long straight lines. That means you use triangles, grid, stars, etc. Rectilinear infill will also allow your print to finish quickly, but is not very strong because it is mostly bridging and the lines only touch where they intersect.]]> the_digital_dentist Slic3r Mon, 27 Apr 2020 10:16:12 -0400 https://reprap.org/forum/read.php?263,871562,871562#msg-871562 Thin walls won't get infill https://reprap.org/forum/read.php?263,871562,871562#msg-871562
So I will get a 2 lines outer side, a 2 lines inner side and between a space of approx 1 or 2 layer thickness.

My infill is default honeycomb. Is the space between the walls to smaal to put a honeycomb in ?
Can I change this ?

Thomas]]> Replace Slic3r Mon, 27 Apr 2020 08:08:11 -0400