I don't think there's any easy way to do this, but I'll just ask anyway. I'm trying to measure features on the inside of this pen. I can't fit my caliper in there to measure anything and it's hard to see in there. I've tried measuring parts that go inside and getting dimensions from that. That works for some things, but not everything. It would be nice to be able to make a section view in real life, but I'm not going to start sawing things in half.