A frame for fixing 2 N52 magnets against each other. This particular frame is for 20x40x10mm (around 23kg of pull force) magnets with clamps for a foil ribbon at the ends. The ribbon width is 17mm, frame material is PETG printed with 230C° nozzle temp. and 85C° hotbed temp. 

Please do keep in mind that impedance of such driver will differ drastically from typical (dynamic) driver type. It will depend on the parameters of your foil ribbon.