Okay, final release. The v5 connector is nice and snug when you glue it to a piece of cardboard as the tile top. I can't wait to see what gets done with these, so please post your makes :)

Glue a cardboard (or 3d printed) tile on top. Connector is 1mm narrower all the way around, but a little more than full height for the spacing. 4mm x 1mm holes in connector and tile base for magnets which may or may not be necessary or useful.

These are oversized, 1.25" per "square" (4 squares per tile base) to make room for walls and such but still have room for 1" miniatures to fit in a square. You can scale down X and Y if you want to print 1" per square, but that will mean smaller magnets too. If the magnets are even useful...

Square tile, 1/2 rectangle, 1/2 triangle, rounded corner, and rounded dead end. Print at 0.25 layer height.

Credit for the idea goes to Michael over at http://project-saros.com