I built a free, open-source tool that automatically repairs non-manifold STLs and splits oversized models to perfectly fit your specific printer bed size.

SuperSplitFile is a command-line tool designed to automatically repair broken meshes and split large STL files into manageable parts for 3D printing. It validates and repairs mesh issues, measures model dimensions, and divides models into a 3-axis grid based on printer size constraints, outputting organized files. The tool supports both automatic and manual splitting, offers optional model rotation, and provides clear terminal logs. It requires Python 3 and dependencies like numpy, trimesh, and pymeshfix for operation.