6) I Made a Mold of a Lego Using Silicone Mold Putty #NewThingEveryDay

Finished MoldI was watching the King of Random’s channel a few days ago and came across a really neat idea: making LEGO gummy Ccandy. He has some notes below the video showing this Instructable where he got the idea.

The first thing you need though is a mold. Sure LEGO has molds that you can buy. And I just went to the LEGO store Sunday, but I totally forgot to pick up some molds. Still, the problem with these molds is that you can’t make the bottoms of the bricks so they lock together, which I wanted. So I had to make my own mold.

Amazing Mold Putty Box

Two Part Silicone Mold Tubes

I didn’t want to wait for materials to ship from an online store, so I did a bit of reading and found Michaels had some different silicone molding putties. These putties are food safe and come in a two containers. You mix equal parts from each container to activate the putty and you have a very short time to make the mold.

Positive Image that I wanted to mold

Since I’ve never done this before I wanted to make a small test mold. I grabbed a 6×12 plate and some 2×4 bricks for my positive image.

Measure two equal parts

Then I measured out 1/2 tablespoon out of each container. I washed my hands thoroughly and began to knead the putty together until it was a single consistent color. The instructions said that you should do this in less than a minute because you only have 3 minutes of open time.

Applying putty to positive image

Once I got the putty kneaded, I began to push it down over the positive image. It was clear right away that I didnt have enough putty for the three bricks so I quickly removed the two edge bricks and formed the putty over the single brick. Even so the putty was a little thin on top so I had to push putty up from the sides to make the mold thick enough.

Finished Mold

After 20 minutes the mold was cured and I removed the LEGO. The brick shape was very crisp at the bottom and the long sides, but I could see that the short sides weren’t filled in properly. And because of all the shifting of the putty that I did, the studs were somewhat elongated. If I tried this again I wouldn’t shift the putty around, I’d just work it slowly over the brick in one motion.

Ice LegoI tested the mold by making an ice cube. I used the plate to cover the mold to get the stud holes on the bottom, but since ice expands this just blew out the top of the brick.

I think the mold putty might be better suited for more curvy shapes like a seashell, the putty was really hard to form around the right angles of the brick. I think I’m going to have to order some liquid silicone mold material online.

* I’m going to admit the text took me 20 minutes to write. My dog was annoying me the whole time the timer was running.

One Comment

  1. kamera sistemi June 9, 2015

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