Toby Casting Plaster
![Screen Shot 2020-12-03 at 10.41.54.png](/proxy/?url=https://content.instructables.com/F1W/SBN9/KI7F7MDT/F1WSBN9KI7F7MDT.png&filename=Screen Shot 2020-12-03 at 10.41.54.png)
supplies needed
- scissors
- clear tape
- pencil
- compose
- set square
- high impact polestiren
Step 1 Squares
![Screen Shot 2020-12-03 at 10.34.09.png](/proxy/?url=https://content.instructables.com/F58/UN90/KI7F7MFX/F58UN90KI7F7MFX.png&filename=Screen Shot 2020-12-03 at 10.34.09.png)
draw 5, 75mm X 75mm squares on high impact polystyrene sheet and cut them out
Step 2 Equilateral Triangles
![Screen Shot 2020-12-03 at 10.55.07.png](/proxy/?url=https://content.instructables.com/F8K/0G39/KI7F7MH1/F8K0G39KI7F7MH1.png&filename=Screen Shot 2020-12-03 at 10.55.07.png)
![IMG 3072](/proxy/?url=https://content.instructables.com/FO2/RCMH/KI7F7MQU/FO2RCMHKI7F7MQU.jpg&filename=IMG 3072)
![Screen Shot 2020-12-03 at 11.06.29.png](/proxy/?url=https://content.instructables.com/FHS/1G1Q/KI7F7MRS/FHS1G1QKI7F7MRS.png&filename=Screen Shot 2020-12-03 at 11.06.29.png)
![Screen Shot 2020-12-03 at 10.34.16.png](/proxy/?url=https://content.instructables.com/FVE/KE67/KI7F7MFY/FVEKE67KI7F7MFY.png&filename=Screen Shot 2020-12-03 at 10.34.16.png)
draw a 75mm line on the edge of the sheet of high impact polystyrene
follow the video using the compare to make an equilateral triangle
each of the sides of the triangle should be equal to 75mm
repeat these steps so that you have 8 equilateral triangles on your high impact polystyrene
cut the triangles out
Step 3 Making the Mold
![Screen Shot 2020-12-03 at 10.34.31.png](/proxy/?url=https://content.instructables.com/FTC/M54D/KI7F7MH0/FTCM54DKI7F7MH0.png&filename=Screen Shot 2020-12-03 at 10.34.31.png)
![Screen Shot 2020-12-03 at 10.34.41.png](/proxy/?url=https://content.instructables.com/FAJ/GQN9/KI7F7MH7/FAJGQN9KI7F7MH7.png&filename=Screen Shot 2020-12-03 at 10.34.41.png)
![Screen Shot 2020-12-03 at 10.34.52.png](/proxy/?url=https://content.instructables.com/FWX/HG7X/KI7F7MCR/FWXHG7XKI7F7MCR.png&filename=Screen Shot 2020-12-03 at 10.34.52.png)
using the images shown above set the squares and triangles in the way shown above
using clear tape attach all the squares and triangles that are touching together
this shape is a Cuboctahedron
Step 4 Making the Core
![Screen Shot 2020-12-03 at 11.15.05.png](/proxy/?url=https://content.instructables.com/FP9/WCBF/KI7F7MT7/FP9WCBFKI7F7MT7.png&filename=Screen Shot 2020-12-03 at 11.15.05.png)
![Screen Shot 2020-12-03 at 11.15.29.png](/proxy/?url=https://content.instructables.com/FNS/CYIM/KI7F7MT9/FNSCYIMKI7F7MT9.png&filename=Screen Shot 2020-12-03 at 11.15.29.png)
make 2 square that is 5x5cm
make 2 rectangles that are 10x5cm
turn this into a rectangle prism
Casting Plaster
![Screen Shot 2020-11-29 at 16.06.33.png](/proxy/?url=https://content.instructables.com/FBI/VN2P/KIEKGMO4/FBIVN2PKIEKGMO4.png&filename=Screen Shot 2020-11-29 at 16.06.33.png)
get a bucket spatula and a small cup
using the small cup and put 2 cups full of water in the bucket
then put 3 cups of powder in the bucket
stir till all lumps are out then pore into the core
place the molded half way into the plaster