So I'm running a D&D 5e campaign, and so far have been doing "theatre of the mind". But it has it's limitations when I want the players to use actual combat strategy in some areas. I have experience a few years ago with using a 25mm paper grid for 3.5e and Pathfinder, which worked well because it was quick to draw a map with whiteboard marker.

Now I have a 3D printer, and I'm wondering if anyone has any dungeon tile recommendations, considering the following:

Firstly, are there any systems that are quick to assemble/disassemble as the players discover new rooms, or we need to clear table space?

Second, stability of the map is important. If a player knocks the map with their hand, will everything collapse, simply shift slightly, or is it rigidly held together?

Third, community: A larger community that contributes (and takes contributions) would be better than a propriety system that doesn't allow homebrew designs.

I've seen a few systems (openlock, openforge, and almost any keyword combination that I can think of is on kickstarter), but I'm finding it hard to get a feel for how popular the systems are, and how well they actually work when on the table.

Does anyone have any recommendations on a good system? I guess i'm most interested in the game flowing smoothly, but I'm not opposed to going to a blank paper grid if that's really the better solution.

The recent post on foss software got me thinking about viable foss alternatives, particularly non programming related.

I just came across FreeCAD and am wondering if anyone has experience using it, how it compares to Solidworks, Autodesk, Rhino or Catia?

I was shown Kicad at uni by a ladtech and was very impressed, way easier and more flexible then whatever microchip software they where teaching.

On a broader level what other professional ffos alternatives do you guys know about?

Is anyone using this stuff on a professional level or is it more hobby at the moment?