2. Molding and Casting
Individual Assignments Design a mold around the process you'll be using, produce it with a smooth surface finish that does not show the production process toolpath, and use it to cast parts.
2.1 Design module
I choose TinkerCAD to design the module,and then use Bambu Studio to print the module.
First, in TinkerCAD, add a cylinder and set its length and width to 30, and height to 2.
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Then, add TEXT and enter AI and Horse separately.
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I add a cube and set its length and width to 33, and height to 4. Then, I set the cylinder and the TEXT as hole, and rotate them 180 degrees.
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Finally, I align these objects and perform the group operation.
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2.2 3D printing the module
I export the 3D model as an STL file and print it with the Bambu A1.
2.3 Casting
2.3.1 Mixing the AB glue and pouring into the mold
Weigh the AB glue according to the ratio of 3:1 (weight ratio Glue A : Glue B).
Mix the AB glue and stir gently in one direction (clockwise) for 3–5 minutes until the mixture is fully transparent and no visible "silk" streaks remain.
Mixing AB glue
2.3.2 Pour the mixture into the mold.
Pour slowly into the silicone mold to minimize trapped air. At about 25 °C, wait roughly 15 hours before demolding; lower room temperature requires longer cure time.
Pouring AB glue into silicone mold
2.3.3 Casting Result
After 24 hours,I get the Casting result:
2.3.4 Reflection — what I learned about molding and casting
- Silicone Mold Making Mixing silicone seems easy, but correct ratios and bubble removal are critical. I initially used the wrong curing-agent ratio, and the mold didn't cure even after 24 hours. Fixing it to 1:50 (curing agent : silicone) solved the problem. For de-airing, I used two methods: poking bubbles with a toothpick and sucking them out with a syringe. Skipping this step leaves surface defects on the final cast.
Always wear gloves and goggles, work in a ventilated area, and allow about 24 hours for the silicone to cure before casting.
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Casting with AB Resin Casting resin is a time-sensitive chemical process, not instant like 3D printing. Weighing by scale (A:B = 3:1 by weight) is more accurate than volume estimation. Stir slowly in one direction for 3–5 minutes until clear, and pour slowly into the mold to reduce air bubbles. At ~25°C, I waited 15 hours before demolding; colder temperatures require more time.
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Safety Points
Silicone: may irritate skin/eyes; use gloves, goggles, and ventilation.
AB resin: wear mask and gloves; keep away from heat/flame; dispose of waste properly.
Always read the safety data sheet before use (group assignment requirement).