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Migaroez/24days mould.md

Last active December 24, 2019 08:42
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24 days mould making
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24days mould.md

Shopping list:

  • A precision scale (ideally 0.1g range if you are going to make a small mould: <=4 chocolates)
  • Plastic mixing cups
  • Wooden mixing sticks
  • protection gloves
  • protection goggles
  • (optional) fume mask, if you are working in a closed environment
  • FOOD SAFE silicone + hardener with a hardness around 40 Shore
  • A plastic container
    • big enough to hold all your models with space in between each model of at least 3mm
    • height of your model + at least 5mm (but 1cm is better) + a bit extra for safety.
    • a flat bottom
    • not too stiff, because you will have to pry you model out of it
    • straight corners if possible
  • A bit of glue, preferably the kind that can be loosened with a bit of heat. To give you an estimate, 1kg of silicon + 100g of hardener made me 3 of the moulds in the picture below + 1 test mould. [INSERT PICTURE HERE]

Alright, let's get to work.

  • Take your plastic container and arrange your models in them until you are happy with the arrangement
  • Glue the models in place. (to save on plastic/time, the models might be printed semi hollow and will rise to the top of the liquid silicon)
  • Put on all your safety gear.
  • Mix up a batch of silicon you think is sufficient to cover everything and add a layer of 5-10mm.
    • It's better to undershoot since silicon sticks to silicon and you can easily make another batch. If you make way too much, you will have waste.
    • Read the manual carefully and adhere to the mixing guidelines. Badly mixed silicon will give a crap end result.
  • Pour the silicon into your container (following the guidelines).
  • Let the silicon harden (usually 12h+ in a room temperature environment)
  • Pry the mould out of the container.
    • Use the silicon's flexibility against itself
    • on a long edge about halfway, press down on the silicon and pull back from the container while flexing the side of the container away from the silicon
    • Slowly work your way to the corners
    • Repeat for all sides
    • Again from the middle of the longest side, stick a fine (not sharp) metal object in between the mould and container and try to lift the silicon enough to get some leverage
    • Once you get a corner free, you should be able to pull it out.
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