For the molding and casting assignment, we molded and casted two fingers with screws attached that can be used as wall hooks. 

To create the mold/negative, I mixed 1.5 oz of alginate with 6.75 oz of water and stirred it with a popsicle stick until there were no clumps. After the alginate is ready, I inserted my index finger and middle finger with a slight bend into the alginate. After a while, the alginate begins to solidify, and I carefully moved the fingers around to pull them out of the mold. 

To fill in the cast, I mixed 35g of rockite with 10g of water. I carefully poured the mixture into the mold and slightly tab on the mold to fill in the tiny gaps. Then I attach a screw wih a 3d-printed jig per finger to make it as a wall hook. 

Casting the Fingers (Positive)

After the rockite dried, I carefully reversed the mold and pull out the casted fingers. After I get the casted fingers, I lightly sanded the bottom of the finger casts to make them into flat surfaces. Then, I post processed the finger casts with thin layers of green spray paint. I also used masking tape to cover the screws because I didn’t want the spray paint to get to the screw. 

This is my final casted fingers. 

This is a cleaned workspace

Bill of Materials

6.75oz Alginate: $1.6 ($3.85 for 1lb)

70g Rockite: $ 0.5 ($15.59 for 5) lb

2hr Labor: $20

Total Cost: $22.1

Overall, I think the process of molding and casting is really interesting as it is a easy process to create such accurate products. I would like to try molding and casting on other things in the future.