Fig. 4: Schematics of common approaches to multi-material VPP processes.
From: Multi-material vat photopolymerization 3D printing: a review of mechanisms and applications

a Multiple vat switching. b Single vat with dynamic fluid delivery. c iCLIP, a specific method of single vat with dynamic fluid delivery. d Unpatterned ink deposition, “Vat-less” VPP.