An example fabrication system includes a light source, a resin container, and a base plate on which resin is cured using the light source so as to build up an object one layer at a time. The disclosed base plate includes a build surface and an anchor channel that extends into the base plate from the build surface. The anchor channel is a recess in the base plate configured to have a narrow width that is closer to an opening to the build surface than a broad width. The base plate can also have a light source that emits light into the anchor channel to cure resin within the anchor channel. Resin anchors cured within the anchor channel to conform to the anchor channel resist being extracted, and an object formed on the build surface remains anchored during fabrication via adhesion to the resin anchors.