For the first GEEK mold instructable I've chosen the Star Wars Stormtrooper mold for "casting" ice "cubes" or chocolate or anything else you can think of - the cool thing is to fill the mold with some fruit syrup and have some improvised popsicle...
UPDATE: please 3D STL model of Stormtrooper attached below - I totally forgot to add this in case someone wants to 3D print it by himself...
Step 1: 3D Model/sketch
This WTM in plain words marks that your design should have no holes and "leaks" where water could came out if in theory you would fill it up. You should not have objects without volume (plain surfaces or curves) - everything needs to be a solid so the printer can make it.
The best way to make sure you have no errors (holes, overlapping triangles, bad edges, etc) which could affect quality of the print, is to use some of the specialized softwares for 3DP preparation - a good free solutions are MiniMagics and MeshLab.
Step 2: Tools and Materials
OK to get back to the mold making, here's what you'll need...
- 3D printed models
- some type of mold frame, I used this round plastic pipe part, you can use whatever you like/have
- plastic container for mixing
- two-component food grade silicone/rubber
- common modeling clay
Step 3: Mix and Pour
One digression - if you are making a two part mold (which I'll demonstrate in another instructable), at this point you would be pressing printed parts deeper in to the clay, to the point where you would like to separate the mold. But let's leave this for this second instructable for now.
Then just mix the silicone based on the manufacturers instructions and pour it over the whole thing...then leave it to dry.
Step 4: Release the Mold
After you remove the printed parts, clean your mold - you can even wash it in dishwasher - it should hold up to 250°C - at least this mine I used...it can easily be used for baking also.
Step 5: The Final Result
Stay tuned for more mold making experience done in your home. Geek on!