Gap in 100% Infill or top layer

[LeChuck71]

Hello,

at the moment I am struggling with the correct calibration of my Si3D.

Coming from a different slic3r^^ my usual way is:

• 1. Set Perimeter to 0.4 mm
  2. Print 20mm Calibration cube, No top/bottom layers, 0% infill, 3 perimeter
  3. Measure perimeter thickness equal to 1.2mm and good bonding between perimeter
  4. Adjust extrusion multiplier according to thickness/bonding to get best bonding versus most accurate wall thickness

So far everything works fine.

Next step is to check for 100% infill and here it shows that my path in each layer is too thin. On the quality guide they say rise the multiplier but if I do this my perimeter thickness (1.2mm @ 0.4mm / perimeter) will be way to thick.

So what to do?

Maybe I did oversee a feature like infill overlap, or infill extrusion width. From what I see is that the infill width should be a fraction thicker to get good results.

Bolt and extrusion is working fine otherwise.

I am thank full for any hint or advice

Cheers
Axel

[CompoundCarl]

Well something that you're saying doesn't add up. If you're printing 3 perimeters and those are perfectly bonded together, they it shouldn't change when you print 5 perimeters or 10 or 100. It should be the exact same since the software obviously uses the exact same settings for extrusion, flow, etc.

So I see no reason why printing with 100% infill would look any different than your 3 perimeters. But perhaps what you were actually looking at was something like 2 solid layers on top of 20% infill, which obviously adds in many other factors such as bridging the solid fill over the sparse 20% stuff below it.

[dorsai3d]

If you print one perimeter with no infill, it's going to come out wider than your extrusion width. From what I can tell, Simplify3D just uses a rectangular cross section for extrusion width/height. This is a pretty safe assumption when you're stacking things up next to one another to get solid areas, but it's not quite exact, and it shows most in this case.

What you're measuring with one perimeter, 0 infill is more of a slot shape, which is going to actually end up wider than your extrusion width if you have your extrusion multiplier set correctly. So if you're getting your extrusion width exactly, it makes sense that you would actually turn out to be under-extruding.

So for example, if your extrusion width in S3D is 0.48mm and layer height is 0.2mm, you would actually be looking for a single perimeter width of 0.52mm. You can find this by some simple geometry, but the gist of it is:

h = layer height
b = rectangular layer width (from S3D settings)
W = Single perimeter, 0 infill layer width

W = b − (π*h/4) + h