This set includes 4 Connected Hex Tiles. These hexes are compatible with the other sets, this is the largest Terrain Feature I've created so far and sits at just over 240mm in height. 
 
All my hexes are designed to use 4x6mm round magnets, they just push into the holes, they may need glue in some instances.

This set is designed with my new V2 Tiles, these have a keyway that allows a 3d printed "key" to be used to help lock the tiles together. I'm working on a press in key but right now it slides in and this makes it difficult to use on all sides at the same time, but it does help stabilize the set and reduces the need for the magnets.

These are 240mm wide at the widest point, they can be scaled to whatever size your printer is and should not cause issues.