Uma Casting

2025 | Digital craft | Molding/Casting

This is the result of trial and error, using a 3D printed prototype and a heat-resistant silicone mold to cast the tin. The spout placement was not ideal, so not enough metal flowed around it, leaving a cavity down the back leg.

Process

1. Materials:

   Prototype	UV resin for SLA 3D printer / Baby powder
   Mold	Molding block / Clay / Heat-resistant silicon (1 kg) with hardener / Release agent
   Casting	Talc / Tin tip (1 kg)

2. Prototype:
   • FDM 3D printed
   • Finished with UV resin and baby powder

   Ref: Skaylabworkshop / YouTube

   

3. Mold:
   1. Build a mold block around the prototype and attach clay to the bottom (for the lower mold)
   2. Mix heat-resistant silicone and hardener (silicone 100g : hardener 3-4g)
   3. Pour the silicone and wait until it hardens
   4. Remove the clay and apply a release agent
   5. Repeat the same process for the lower mold
   6. Cut out for a spout and air holes
   

   

   

   
4. Casting:
   1. Coat the inside of the mold with talc
   2. Melt the tin blocks in a pan
   3. Pour the tin

   Ref: Sand casting blog / YouTube

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Notes:

• The mold must be kept hot to prevent the metal from cooling too rapidly.
• Place the spout with consideration for the flow of metal.
• Don’t use plastic tools, use steel or wooden tools.