Firstly sorting out different plastics washing and then cutting into pieces
PET bottle
HDPE milk bottle
I then made a simple mould by fly pressing aluminium and created feet by bending down the corners. I also made a tapered wooden presser.
With heat from the heat gun and pressure from the plug, I woulded the soft plastic into the mould.
HDPE plastic bag
HDPE milk bottle
All the plastics that worked with this method were PP (polypropelene), PS (polysyrene) and HDPE (high density polyethelene). The plastic that melted down the best and created the smoothest surface was PP. PS created a sort of crystal structure.