Hi everyone This is a simple vacuum forming machine designed to be used with A4 sheets of plastic. You need to weld the plastic holder together. To use the vacuum system, you will need to cut a hole in the vacuum box to fit a shop vac hose. It is recommended to use rockwool to insulate the heater box. Seal the vacuum box nicely as well. Seals in the design are meant to be soft rubber-like silicon. If you have any questions just ask in the comment section. Happy Vacuum Forming