а можно сделать очень просто - у вас уже есть готовая прессформа для вакуумной формовки. на ней надо насверлить дырочек диаметром около 1 мм (в местах, куда пластик не протягивается), побрызгать её силиконовым спреем и попросить на любом производстве сделать вам 5-10 (или сколько нужно деталей) ударов на формовакуумной машине. будет качественная деталь и заплатите копейки.
а если хотите делать по вашей технологии, то дырочки насверлить всё-таки стоит и во время формовки дополнительно грейте проблемные места строительным феном. пластик советую греть электронагревателем (+феном), а не лить на него горячую жидкость.
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