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OP there is a thread over on the official forum with free drawing files for laser cut terrain. Some of the replies on that thread mentioned prices for getting stuff laser cut but it seemed to vary pretty wildly depending on where people were getting it done.
I downloaded the files from the other thread and looked at getting some stuff cut locally. There is a local Fab Lab that provides free access to laser cutters etc but time is limited and you have to book in advance. They sell some materials on site but they didn't have
mdf available. I contacted them to see if they could cut it and they said they could if i brought the material along. A sheet of
mdf 2.5m x 1.5m was about £6 so the cost of materials is pretty minimal if you have access to the cutter (no not
that cutter!

).