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Good stuff.
What are you doing to go from Sketchup to a file for your printer? Do you have the paid version of Sketchup? Are there problems with the files not being 'water tight'?
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I'm just using the free version. There's a plugin-for Sketchup that exports directly to a .STL file.
https://extensions.sketchup.com/en/content/sketchup-stl
I'm using Cura as my slicer in Repetier, and I do get "Manifold, not water-tight" warnings on some files, but if any flaws or gaps are within the layer thickness, the printer just keeps on chugging along. I find there's a lot of false positives on this warning for many .STL files I'm trying to print, either tiny errors in the geometry that are way smaller than the print resolution/layers anyway, or it really is something you want to be hollow, but the slicer just doesn't get that it's okay.
Although, for the flare/smoke capsules, if I use tools like the offset, and stretch, or the "shell" plug-in from the Sketchup Extensions site, it comes out okay with no manifold/watertight errors. They're a lot easier than fiddling forever to make stuff join up.
I was screwing around forever trying to draw a nosecone centered and parallel inside the outer nose cone to get my thickness... and then went searching knowing there had to be a better way, and found the "shell" plug-in, and had a perfect nosecone with thickness in about 20 seconds.
For instance, here's the underside view of making the nosecone/capsule body for smoke/flare. These are thicker than something that's going to be a chalk marker, so it doesn't burn through or melt right away, although I might work out some relief vents for them eventually for smoke... I'll see how it does squirting out the fuse channel in the fins first.
I start out making a line on the axis, using the arc tool with that line as endpoints, then stretch it out to half the diameter of the 26.5mm bore, or 13.25mm (Use the 3D printer template workspace, so you get fractional milimeters...) Then I draw a perpendicular line to the midpoint of the arc and erase the bottom half. On the same axis as the original line I drag out a circle, then use the "follow me" command so it sweeps the 1/2 arc into the nosecone shape. Then I drag out the bottom tube from the bottom circle of the nosecone. Then I group selected all the points of the nosecone, and used the "Shell" plug-in tool to make it 3mm thick to the inside.
Voila, a heavy nosecone.
Here's the video I followed to do what I described above, save for the shell plug-in to add the thickness.