A friend made some STL [sKP] files for me with Sketch Up. They load okay in Cura but don't print despite showing they have sliced okay.
I have tried using Slic3r and when file loads whole sections of the walls are missing and are triangular instead of rectangular in places. It reports that it has fixed hundreds of manifold areas.
I have tried Rhinosceros 5 64 bit and GOM 7.5 SR2 to attempt to sort these problems out manually as it appears the automatic fixing of errors selects the wrong lines as the outer and inner edges. This shows up well in GOM where one wall will be shown with the diagonal on the top being part of the outer wall instead of the parallel one to the other, and in some case at the corner posts using the diagonal in the post instead of the parallel inside and outside lines. You can even get a diagonal from say the topinside right corner to the bottom outside left corner becoming an edge of a wall.
Have tried manually deleting incorrect mesh lines but this only allows a small number to be removed unfortunately.
According to Nettfab it says there are 180 triangles, 318 edges and 80 points. It has a big warning sign on screen when it loads although it claims the unit is 100mm x 100mm!
Now according to my working out and looking at the drawing there should be 32 points for the four posts 10mm x 10mm [8 each, four top and botton] that are set on top of a 100mm x 80 mm x 5mm base and 8 for each of the four walls that are inset 2mm from the edge - another 32 - giving 64 points in all. The walls are 5mm thick and 35mm high.
The top of each post has, correctly, 8 points - 4 for post angles and 4 for where two walls attach giving 32 in all. The bottom of each post has 12 points giving 48 in all. The problem is how the mesh triangles connect them AND MORE IMPORTANTLY how the slicing programs read which are the lines that are the real edges, and which are meant to be internal lines.
I have replicated part of one model - one post on base - and printed with no problems.
If anyone has any ideas I do have small jpg images to illustrate, but haven't worked out how to post them.
Thanks for any help offered. Can send images to you if you think they will be of use.