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Mold making is yet another thing I’ve had tons of interest in for a long time, but have never really done much of it.  The one occasion that I tried it out was to make some climbing holds, which worked surprisingly well, actually.  I was able to find everything I needed at inventables.com so I decided to give it a go.

I was surprised at how well it worked on the first try. Although the mold wasn’t perfect, and the cast wasn’t either, they were both really close.. and for my purposes, good enough.  Having done some research, I found that having a vacuum chamber (I have to see if I can make one of THOSE) is hugely beneficial for removing the air bubbles from both the molding and casting materials.

Check out my process below, and if you have more experience with silicone molds, please leave some tips and tricks in the comments below!

Here’s what you’ll need:

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Measure your item, then add 1/2″ to each side.

mold_making_1_measure

Measure out four strips of plastic or foamcore for the box sides.

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Cut the sides out, just make sure the height is well above your object’s height.

mold_making_3_cut_strips

Cut a square for the bottom piece of the box.

mold_making_4_cut_bottom

Hot glue your object in the center of the box bottom.

mold_making_5_hot_glue_figure

Hot glue on the walls of your box.

mold_making_6_hot_glue_box

Seal all cracks with hot glue.

mold_making_7_seal_edges

I used Oomoo 30 for the mold material.

mold_making_8_oomoo30_smoothon

Mix the parts at a 1-to-1 ratio.

mold_making_9_one_to_one_mixture

Mix thoroughly, scraping the sides and bottom fully.

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Slowly pour into your mold in a thin stream to reduce bubbles.

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After it’s cured, remove the box from the mold.

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Cut a serpentine pattern on two sides.

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When you’ve opened the mold enough, remove your object.

mold_making_14_remove_figure

The molds maintain ALL of the tiny details.

mold_making_15_mold_detail

Spray the inside of the mold with a release agent.

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Using wooden side supports, tape the mold to keep it closed.

mold_making_17_blue_tape_silicone_mold

Mix your resin. In this case, I used a 1-to-1 mix urethane resin.

mold_making_18_mix_urethane_resin

Slowly fill the mold, spinning the mold to fill pockets and release air bubbles.

mold_making_19_pour_urethane_resin

After it fully cures, remove the cast item.

mold_making_20_remove_cast_action_figure

Check out the final result!

mold_making_21_final_result