Injection molds usually require extremely high pressures for form plastic. After I looked at some injection mould machines, I found that they are usually rated by the volume of molten plastic and a certain number of tons of pressure. I found some injection mold machines which were rated for 4 oz of molten plastic and 65 tons of pressure. I wanted to see I I could possibly bypass the pneumatics and press the two halves of the mold by hand and still manage to form a cast. It turns out that it really is possible to form a part at home even by pressing the mould halve manually. If nichrome wire is used to heat the mold while it is being pressed, it is actually very doable.