This is a Large Rock that is composed of Two tiles. It is compatible with all of my other Modular RC Course tiles. All my hexes are designed to use 4x6mm round magnets, they just push into the holes. It also has a 3d printed keyway that reduces or removes the need for the magnets.
A blank hex template and keys are available for free.
These are 240mm wide at the widest point, they can be scaled to whatever size your printer is and should not cause issues.