First-time shaper here. I've got a fairly simple model that I made in SketchUp, which I'm trying to have printed as part of a gift for my sister. I took pains to build it soundly and responsibly, but apparently it wasn't enough - non-manifold errors, of course. It should be a simple fix, would anyone like to take a look at it?
I've attached an exported DAE, but of course could also send native SKP.