Slip casting update

Notes to self:

  • 6 minutes of kick time seems like a lot until you suddenly have to patch your mold because you’ve noticed there’s leaks in it
  • Adding more water after it starts to kick does not slow it down, it just makes it fail entirely
  • 1mm is not enough thickness on your outer shell, either
  • Starting with a 100mm square pot was probably a bit ambitious
  • It’s probably easier to mix the plaster in multiple small batches instead of trying to make it all go at once

Oh well, it was a good learning experience, as long as I actually learned from it.

For my next attempt I’m going to do a much smaller 60mm square pot.

Rough calculations on plaster requirements:

  • Inner plug has a volume of 365mL
  • Outer form will have a volume of 11.5 x 11.5 x 13cm = 1720mL
  • Therefore, I’ll need around 1355mL of plaster, which is:
    • 1409g of plaster
    • 975mL of water

Also this time I’ll just make a foamcore outer form rather than trying to be super-fancy with a PLA one. It just isn’t worth trying to be super-precise with this.

I’ve also found that modeling the plug as a solid form rather than trying to hollow it out actually saves print time and filament, because sparse internal supports are way more efficient than external supports. Go figure. And it also makes the volume calculations easier.

Comments

Before commenting, please read the comment policy.

Avatars provided via Libravatar