Homemade 3D printer goop made from maltodextrin costs 1/50 of the real stuff

A University of Washington engineering professor has come up with a new goop for his 3D printer that costs 1/30 - 1/50 of the authorized goop, using a mix of clay, sugar and nutritional supplements, then open sourced their formula. Basically, these guys are the inkjet cartridge refillers of the 3D era:
About five years ago, Mark Ganter, a UW mechanical engineering professor and longtime practitioner of 3-D printing, became frustrated with the high cost of commercial materials and began experimenting with his own formulas. He and his students gradually developed a home-brew approach, replacing a proprietary mix with artists' ceramic powder blended with sugar and maltodextrin, a nutritional supplement. The results are printed in a recent issue of Ceramics Monthly. Co-authors are Duane Storti, UW associate professor of mechanical engineering, and Ben Utela, a former UW doctoral student.

"Normally these supplies cost $30 to $50 a pound. Our materials cost less than a dollar a pound," said Ganter. He said he wants to distribute the free recipes in order to democratize 3-D printing and expand the range of printable objects.

Glitzy three-dimensional printers have become common in the industrial world, churning out fast 3-D prototypes of everything from airplane parts to running shoes. But the machines also are becoming popular among artists, hobbyists and educational institutions.

3-D Printing Hits Rock-bottom Prices With Homemade Ceramics Mix