Chocolate Skull Mold Maker

by akaziuna, published

Chocolate Skull Mold Maker by akaziuna Oct 31, 2012


You can use this thing to cast a food safe silicone chocolate mold. Then use the mold to cast little white chocolate skulls with pointed teeth.

Voila! I turned a scanned skull into chocolates. Happy Halloween!

I also wrote a detailed Instructable on how to make the molds and cast the chocolates: instructables.com/id/White-Chocolate-Skulls-in-PLA-Trays/

Also posted on my site: blog.kaziunas.com/?p=5646

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Bueno por "Dia de los Muertes" en Mexico. Treinte uno de Octubre.

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I wrote this project up as a full instructable: instructables.com/id/White-Chocolate-Skulls-in-PLA-Trays/

1. Print with 13% infill and 3 shells.
I have provided two versions, on with thin walls (1.3mm) and one with thicker walls (2.3mm). The one with thin walls in not completely watertight if you print it with a raft. I used liquid tape on the bottom to make it water tight, but in the end the rubber mold mix was very thick and I don't think the liquid tape was actually necessary.

The thicker on will take much longer to print. In the end, the thin walls one should be fine to pour the silicone rubber into, but I have only made one mold so far. I included the OpenScad if you want to experiment. Make sure the vampireSkull_0.2.stl is located in the same directory as the OpenScad file.

2. Get some Smooth On SmoothSil 940 food safe silicone rubber: smooth-on.com/a25/Smooth-Sil%3D-940-Suitable-For-Food-Related-Applications/article_info.html

3. Mix rubber, pour into 3D printed chocolate mold. Let set for 24 hours and follow heat curing instructions. Read the datasheet: smooth-on.com/tb/files/Food_Grade_SS940.pdf

4. Demold. You will probably have to destroy the 3D printed form completely. I tore mine completely apart.

5. Get white chocolate melts that do not require tempering. I used these and they worked great: chocoley.com/badabingbadaboomcandymelts.htm.

6. Heat chocolate melts in a double boiler.
Follow instructions that come with the chocolate: chocoley.com/chocolate-candy-making-guide/melting-bada-bing-bada-boom-chocolate.htm While melting the chocolate, add a small amount of Lecithin. The Lecithin will help with the demolding and has other benefits when used in molding chocolate: en.wikipedia.org/wiki/Lecithin. I used Whole Foods softgels (available in the supplements isle). I cut the softgels open and squeezed the oil out. I not very precisely used around two small handfuls of chocolate to the oil contained in 4 Lecithin pills. Discard the softgels after squeezing out the oil.

7. Put silicone mold containing chocolate into the refrigerator until the chocolate solidifies. (about 20 minutes)

8. Carefully demold the chocolate.
These are a little difficult to get out. Wear candy makers cotton gloves to avoid marking the chocolate with your fingers. Twist the rubber mold to loosen the chocolate. It will help to have small hands (I do and I am able to remove the chocolates without destroying them). I found that after loosing the chocolate by twisting the mold, it is easiest to twist out the face and rotate it out of the mold. Then grab the face and pull to remove the rest of the skull from the mold. You may smear the teeth a little, but overall it seems to work the best.

I have made three batches so far and I managed to get all of the chocolates out of the mold without destroying any of them.

UPDATE: I have added a candyTray.stl file. I used this OpenScad script to make it: thingiverse.com/thing:15113 It will accomodate 4 skull chocolates. You can print it in PLA (red translucent Ultimachine PLA pictured), place the chocolates in it and then wrap it all in a plastic treat bag and give them away!

ANOTHER UPDATE: After demolding many rounds of chocolates, the base of one of the skulls started to split a little from flexing the mold. I found that it had no impact on the quality of the chocolates coming out of the mold and it made it much easier to demold the chocolates. I cut little notches with a razor blade straight back perpendicular to the base of all of the skulls. (see pic, the notches are only visible if I flex the mold) It makes it much easier to get them out of the mold.

FINAL UPDATE: I cast many, many batches of chocolates with this mold. I was very pleased with how they came out, so I am done tinkering with this thing. (turning off the "work in progress" indicator.)
Bueno por "Dia de los Muertes" en Mexico. Treinte uno de Octubre.