europound one anti-warp mould

To stop warping I place pound coins on the heat table away from the raft footprint so that they heat up. As the build exceeds the height of the raft plus the height of a pound coin I simply place a pound coin edge onto the raft. As the height increases I put more pound coins on and the weight seems to stop the raft warping. The bigger the model the more the coins needed.

To get the height for insertion right I have made some moulds that can be added close to the raft so that the rims overlap,