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I build a box out of lego bricks and stuck a cardboardbottom to the box with tape. ( The bricks are reusable). Then I placed the walls in the box and fixed them with superglue to the bottom. If you don´t do that the master may float up durig pouring of the resin and the mould doesn`t work later.
I use silicone and resin by Rairo a German hobbystuffprovider.
When the silicone is set ( after about 2 hours you can get rid of the box.
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