If you ever do successfully copy it, don't share publicly. Hasbro has a patent on it and they have a history of enforcing it.
Thanks for the warning DarkSpade. I definitely am not and will not be copying Heroscape.
I didn't want to drill holes in my Heroscape tiles to add trees, so I wanted something else. Also, many Light Forests / Heavy Forests are on Level 0 which means that I didn't want a raised Hex. I wanted something thinner.
The Hex Tile design which is on Thingiverse enables someone to print a tile which interlocks into Heroscape tiles, but it's not a Heroscape tile and it doesn't interlock to other 3D printed tiles. There is a gap between the 3D printed tiles which means that they won't lock together, which is something that the Heroscape tiles do.
So effectively I'm leaving the Heroscape tiles as the base building blocks, and then adding some 3D printed 'icing on the cake' around the Heroscape tiles. For example, adding a tile on top, adding a tile beside.
For my 'thin tiles', they're just going to sit flat on the gaming mat. I've already realised that this means that they won't interlock to one another, but that's okay. If it's really a problem, I'll blue-tac (sticky-tac) them together for the game, and them remove later.
Yes, I could design a completely new type of 3D tile (like Warhex) but it'd be a lot of mucking around. Maybe one day....