It seems to me that the compression machine using a domestic oven is quite an inefficient way to make things. In the first world, old ovens are cheap, plentiful and there is no problem running them on a domestic power supply, but in developing countries, if there is a power grid at all, it can’t cope with the 4kW+ that most ovens use. And when recycling plastic it’s important to consider the source of the energy used to do it, and the environmental impact, or you could be doing more harm than good.
I have developed this machine to be as energy efficient as possible and to work even in areas with no power, it can run directly off a single PV panel. The machine in the video is a prototype but I would like to build a full sized one approx 4x bigger that can produce larger pots, bowls etc. using interchangeable moulds. I have a crowdfunder set up here: http://www.crowdfunder.co.uk/plastic-recycling-machine (please share!)
The small flower pot made in the video uses 74 Watt-hours of electricity. That’s approx. one twentieth of what it takes to warm up a domestic oven to operating temperature, before you even put the plastic (and moulds) in. You also don’t need a shredder as quite large pieces (whole caps etc.) can be put in the mould and the heat and pressure fuses them solid with almost no voids or air bubbles.