Fro another project I need custom shaped plastic parts. Since my 3D printer is only in the design stage right now (I just finished software prototyping) I decided to try my hand at casting. This is my first attempt
The piece is sculpted with Plasticine and cast from fiberglass resin. These are not the best mateials to use but they are cheap and get the job done.
I was inspired by Sylvia's Super Awesome Show, she made it look easy.
Step 1: What you need
The main ingridient here is fiber glass resin, you should find it in hardware shops. the shop near me also had casting resin, wich is better for making big casts, but it was twice the price. Fiberglass resin will work but when it cures it gets hotter than casting resin, in a large cast it can get so hot that it cracks or burns.
Plasticine (oil clay)is used for making the master shape. Real Plasticine is meant to melt hen it gets to about 100C which would make it easy to get out of the mold. Unfortunately mine was a knock off that just caught fire.
Plaster of Paris is for making the mold. you pour it around the Plasticine sculpture.
Not pictured is Lego, for making a box, and plastic wrap or aluminium foil for lining the box.