slicing bug with small cylinder on large cylinder

[Levi8than]

I'm running version 2.2.2 on windows 7 x64, and am printing on a makergear M2.

I have this small toy nail that I'd like to print with more layer thickness to make it less likely to break, but there is no foundation being placed between the the upper and lower cylinder.
The walls of the upper cylinder are being placed directly on the infill, which results in a failure point.

I've pasted 2 screenshots of the gcode preview side by side with an arrow pointing at the clear flaw. You can see the 5 perimeters of the upper cylinder are being printed directly on the infill from below, with no foundation under them, so the adhesion is poor at best and the toy breaks easily at this location.

gcode preview

Broken prints:

nail prints

Factory file attached.

Please help me fix this. Thanks.

[jimmybuckets]

Can't find it right now but there is another active thread on this right now as well. Your not the only one sir. Found it...

http://forum.simplify3d.com/viewtopic.php?f=23&t=1809

[JoeJ]

The best way to make a strong bond there would be to make several solid layers at that intersection between the small and big cylinder. That way you will get a really strong bond. I would also use another process for the top section. This way you will have the top and bottom solid layers printing on top of each other which produces a very strong bond. When you go to print, just make sure to select both processes and use a continuous printing mode.

If you haven't done this before, you might want to read their tutorial: http://www.simplify3d.com/support/tutor ... f-a-model/

[jimmybuckets]

While its true you can run another process to get a stronger bond...but you shouldn't have to run another process to get the slicer to work properly. So running another process is actually requires running 3 processes, the first, the solid and another to turn back to your original process setting. I don't mean to come off as an ass...but the slicer doesn't work properly in these situations.

[JFettig]

100% agreed that they NEED to fix this!

My work around is making a super thin cut inside the part, usually .0005" thick in that area to force it to create thicker walls, it'll create your border passes around the cut and beacuse its so thin it'll bond together.

[jimmybuckets]

yeah you can do that or add a process with 100% infill from just below the area in question to just above...then do a third process that goes back to your desired infill

[MFitz73]

while I'm new to S3d, I've always followed a rule of thumb to add a bevel to areas that need a bit more strength in my 3d prints, even if its only a slight bevel.
I think the base of your cylinders would gain some strength by adding that.

Also I noticed that the infill in S3D tends to be a big more squishy then infill from other slicers I've used. I'd like to see some more choices on infill patterns

[jimc]

mfits, be sure you have the random infill placement box unchecked and the infill extrusion width set to 150% or bigger. outline overlap to 25% or so.

[jimmybuckets]

While those suggestions will help the problem is with the slicer itself. To get around this bug you have to manually create extra processes to create solid infill in those areas. Until they fix the bug this is the only work around.

[JoeJ]

I believe jimc was suggesting an answer to MFitz's question about squishy infill. Disabling random infill placement and increasing the infill extrusion width to 200% makes a HUGE difference on the strength of the infill. So yes, those changes will make a big difference and the software already has those options. No need to make extra processes for that one.