Build parts disappear

I created my build in SketchUp Pro, printed my cut list and came back to some pieces completely missing. I’ve also got some components not staying together, or connecting with other components. This all happened after I printed it, and came back the following morning.

Is it a me problem or a SketchUp problem? Please help, I’ve got a really important deadline riding on this!

You need to post your model so it can be assessed for an answer. Drag the .skp file off your hard drive into a response window. It’s unlikely that it’s SketchUp.

A complete guess is that you are using tags incorrectly and merging geometry.