Computed Axial Lithography (CAL) is a novel volumetric additive manufacturing process that prints parts in a single step rather than layer-by-layer, enabling more complex geometries and faster print times than conventional 3D printing. In its most basic form, CAL uses a visible-light projector to selectively cure a rotating vial of photopolymer to build a part. OpenCAL is an open-source printer that broadens access beyond controlled labs for educational, research and hobbyist use. The system is designed for easy assembly with minimal tooling and includes a complementary post-processing solution, CentrifuCAL, to efficiently separate printed parts from excess resin. This project lowers barriers to entry and enables broader research, education, and future innovation in volumetric 3D printing.