Those inventive folks at the University of Washington are at it again. This time they've been working on a simple formula for cementenous metalcasting. In other words, material with which you can make an effective mold for molten metal casts. At one point, they were using this recipe:
- 1000 parts VersaBond
- 250 parts Maltodextrin
- 250 parts PVA powder
When mixed with just the precise amount of moisture and deposited appropriately by a 3D printer, you'll get yourself a near-rock-hard mold suitable for sloshing in a hot metallic liquid of your choice. What will your first cast be? We know what Open3DP's will be (see image above).
However, after subsequent experiments with other substances including - apparently - Rice Wine (all for good academic use, we're quite certain), they have arrived at the ultimate formula:
There is no formula. Just go to the hardware store and purchase a 50 pound bag of USG Hydroperm for USD$30!
That's perhaps the simplest and best answer one could hope for. Well, done, Open3DP!