Answer: Get a reusable master model and it will fix all your problems!
Ok, let me break it down for you:
1: Get a Master Model
This is the prototype of your product.
It is the original shape of the product you want to turn into a mold. It could be 3D modelled and 3D-printed (recommended) or hand-sculpted.
I recommend a 3D-printed master model for the best quality and reusability.
2: Make a Mold Box
This is the container that will hold your master model while you pour silicone.
It can be 3D modelled and 3D printed too (recommended), or made from plastic, cardboard, or acrylic sheets.
I recommend a 3D-printed mold box because it is reusable and will save you so much time.
3: Place the master model inside the mold box
This is so you can pour silicone rubber onto the master model without the silicone rubber spilling all over the place.
Secure your master model in the center of the mold box using a small dab of hot glue or double-sided tape underneath it. This keeps it from shifting when you pour silicone.
Make sure it’s level and there’s enough space around it for the silicone to flow on all sides.
Or you can use my favorite method. Use a 3D printed mold box that was designed specifically for your master model. This way you will never have to use any hot glue of tape. All you do on this type of mold box is clip it together and you have a mold box.
4: Apply Mold Release Agent
This is the lubricant used to prevent the silicone mold you’re about to make from sticking to the master model and mold box.
Spray the master model and the inside of the mold box with a mold release agent so they don’t stick to the silicone mold you are making.
5: Mix and Pour Silicone Rubber
Silicone rubber is the silicone in a liquid form and when mixed with a catalyst (comes with the silicone rubber) it will harden into a silicone mold.
Use a kitchen scale to measure your silicone rubber and catalyst, mix well, and pour it inside the mold box.
6: Let it Cure, Then Demold
Curing is the process where the liquid silicone transforms into a solid, flexible mold.
Let the silicone sit and cure for 24 hours. Once it’s fully cured, remove the mold box and carefully pull out your master model from the silicone.
Now you’ve got your brand-new silicone mold!
My first silicone mold was a bubble coaster mold. If you want to get the exact same bubble coaster master model I used to make my first mold and coaster, Download the 3D design file here and 3D print it. Click here to download it now!