1.Prepare the Mold Material

The mixing ratio is 33g alginate and 125ml of cold water. I need to stir the mixture thoroughly so that before it is cured.

2.Mold the Finger

It is better to have my alginate in the small cup instead of the big one because it will be convenient for the next steps. Put my finger into the mixture and avoid to touch the side of the cup so that I can have a complete mold. After holding my finger inside the alginate for about 3-5 minutes, I can gently remove my finger.

3.Cast the Plaster

The mixing ratio of water to plaster is 2:1. When stirring, I aim for a smooth, pancake-batter-like consistency. Then pour the liquid inside the mold. Finally I need to fix the screw at the top of the model (bottom of the finger) and use a 3d printed piece to hold the screw.

After an overnight dry, I take the plaster model out from the alginate mold.

However, I noticed that there are some small air bubbles on my finger model. I remake my fingers with more strict ratio and slowly pour the plaster into the mold, but there are still some bubbles. I cannot completely solve this problem till the end of the project.

4.Spray Paint

I used the green spray, and wait for it to dry.

Workspace after I used:

COST ESTIMATION:

Material:

on amazon:
alginate $50/3lb * 165g = $6.06
plaster $13/32floz * 400g = $5.5
screw $7.6/165 * 5 = $0.23
spray paint: $11*0.01=$0.11

Labor:
$30/h (Houston average wage)
30*2=$60

Total:$71.9