Hey,
So I’m having an issue where when I try to thicken up the inside of the model with infill, the slicer simply leaves it empty with 3 outer wall lines no matter how I change them. It’s almost like anything under the “Strength” section of options have absolutely no function.
I have printed several other items just fine, even the exact same model but with thinner lines that I didn’t like so well, but for some reason this thicker version I made to be more durable won’t slice with infill.
@keagen98, it looks like that outside cylinder is not connected to the inside cylinder. You won’t get infill if it is simply a cylinder inside a cylinder. Zooming in, I can see the support structure base layer thru your two cylinders which tells me you don’t have a floor connecting them. That’s the problem…along with there not being a ceiling either.
Double check that you have “Sparse infill” checked to display.
The inside cylinder is actually a support, probably should have mentioned. The object is the two lines on the left side with all of the other supports holding it up. It’s angled upwards. It’s a 1/12" thick plastic shoulder pad for a costume, if that helps get an idea.
Everything is connected with faces. I’ll check the model and may have to re-topologize maybe, but it’s the same one I used before just thicker so I’m not sure why I’d need to
You have a hollow area here (highlighted in blue) that will not get filled unless you close it in. As far as the slicer program is concerned, your intention is to have two walls separated with a space. You’ll have to close that in, both on the top and on the bottom, to get it to fill.
If the inner cylinder is intended to be part of the model, you usually need to close the top and bottom of the gap before it will be infilled. You might be able to set top and bottom layers to zero.
I think your model would print just fine without the extra support structure as long as you have a good brim. If that is not enough to prevent the wobbles, I would use the paint tool to manually add supports. Organic tree supports with a small x-y support distance would keep it in place and come off easily.
So I double checked the model in Blender today where there is that blue “gap” somehow when I used “Solidify” to thicken the walls in that program, it made an extra wall inside the model in the middle (each wall circled in blue in the picture in grid view). Looks like it may just be an issue with the model and not the slicer. I’ll re-make the model differently to eliminate that extra wall and see if that solves it.
@lkraus I didn’t even know you could paint supports manually 
thanks for the tip, I’ll have to try that since I think auto always prints WAY too many supports. Definitely goes to show I’ve only been printing for about a month
It was the model, just a pro tip for anyone using Blender specifically, don’t use Solidify twice after it has already been done. Subdivide the flat model first, apply, THEN solidify so items are the proper thickness. If there’s any similar software like Maya that does the same thing I’m not sure if the same thing applies.
In other words, make sure you don’t have extra faces in your models 
More user error than software issue but if someone else has this issue then it could be modelling. Thanks all for the help and suggestions.
This right here. No clue how it got unchecked.
