Dual feed progressive cavity pump extrusion system for functionally graded direct ink write 3D printing oleh Max J. Sevcik, Jacob Golson, Gabriel Bjerke, Isaac Snyder, Gage Taylor, Finnegan Wilson, Grace I. Rabinowitz, Dylan J. Kline, Michael D. Grapes, Kyle T. Sullivan, Jonathan L. Belof, Veronica Eliasson