Huh, how do I model this?

[Marm]

Ok, tried sending it to the printer, and it did exactly what you said. Loaded onto the printer, the machine moved for a second, then went to the main menu.

There's something sketchy about the file. I've never seen a sliced print do that to the printer.

I took the STL and imported it into Sketchup (sue me lol), and this it what I saw:



That double wall, which is not complete, is probably giving the printer issues. When I sliced at 5% infill, I saw a bunch of weird overhangs within the structure. The Design IS manifold it seems, as that interior void is probably solid, but it's confusing the slicer/printer. Edit the STL to remove any internal structure that shouldn't be there.