Grab some milk or cream, and some lemon juice or vinegar. Put the cream in a saucepan and heat it, using the lowest setting on the stove and stirring constantly to keep it from burning. When it starts to simmer, spoon the vinegar and lemon juice into it until it curdles through, and then leave it to cool. This makes a very soft plastic – to make it harder, the milk has to soak in the vinegar for a long time.
- Household materials are going to be quite inconsistent and thus any plastic produced could have wildly different characteristics. This would make proper calibration almost impossible.
- Even if one could produce plastic with consistent and known characteristics, there’s the issue of how to delivery it to your 3D printer, which likely expects a rigid filament of specific diameter. It doesn’t expect a bowl of mush. A method of rigidizing and extruding the plastic is required.