Broadly: set the build file to Mono Color (black → black), duplicate it once per channel and assign each copy a colour including both whites, stack them in the Composition tab with the colour file on top, then set a high overprint count on the build layers and one on the colour layer. Your printer supplier is the right source for the exact settings for your machine and ink. PatchForge's job is producing correct files; the RIP recipe is yours.
Sep 12, 2026