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On CNC machined moulds I use min. technological draft 2°.
If the mould is welded, based on sheetmetal parts or something similar, be very carefull about inner tension caused by welding. The best is TIG and design very stiff and strong support frame. If the mould is machined after welding, there is a highly recommended make roughing - high temp.stabilization - finishing - polishing.
If possible, use cold joints...screws, bond, rivets etc...instead welding.
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