Before starting, decide which plastic to use and how to obtain it. We commonly use PP or HDPE, collected locally in Berlin. If plastic flakes are unavailable, seek alternative sources.

Custom engineered molds can be expensive, especially under current conditions. Therefore, we use a simple cake tin as a prototype stool mold, as shown in the picture. It was obtained from a supermarket and functions adequately.

Attention: Verify if the bottom of the cake tin is level, as it will shape the top of your stool.

For our machine, we use an oven modified for compression. Place the mold inside and heat it to 250°C (482°F) for polypropylene.

Fill the cake tin with granulated material and place it in the oven. Bake for approximately one hour to ensure thorough melting. Remove from the oven and allow it to cool for another hour. Once cooled, open the tin and remove the seat.

To level the top surface of the seat, use an electric planer. Collect excess material for future use.

Initially, we tried wooden legs but found them difficult to secure to the seat. Ultimately, we chose metal legs that can be easily attached beneath the seat.

Purchase the legs at a hardware store or online. They include screws. Evenly distribute the legs at the base of the seat and fasten them with the screws.

Once assembled, turn the stool upright and it is ready for use.