I got some 4 bot molds and tried them with hot glue. This is about 45 minutes worth and 8 sticks (out of pack of 18) of hot glue.
How to
Push down on glue to fill mold
Peel back to check and fill as needed
Easy de-molding
Clean-up required
After clean-up
Comparison with Dwarven Forge
That can provide two 2×2 tiles.
I accidentally got 1/2 walls which may be too thick to use. Oops.
fmalexander 