STL Resizer

STL Resizer accepts an STL file and a target maximum dimension in millimeters to produce a scaled STL that fits a printer bed. It handles both ASCII and binary STL formats and outputs a single resized mesh. The process computes the model's bounding box and applies a uniform scale so the largest extent equals the target size, preserving original proportions. This enables consistent print readiness across parts and projects.
Conceptually, the tool treats the model as a set of 3D vertices, detects units or assumes millimeters, converts as needed, and calculates a scale factor. Each vertex is scaled by that factor to maintain aspect ratio and topology. An optional centering step positions the scaled model around the origin to simplify placement in print workflows.
Beneficiaries include hobbyists, engineers, and educators who require predictable sizing for assemblies or standardized parts. The tool distinguishes itself by automatic unit handling, support for both STL formats, and a straightforward export of a single scaled file without topology changes. It does not perform mesh repair or color/texture preservation.
Common use cases include resizing a 120 mm model to a 60 mm bed, converting inch-based designs to metric, and producing consistent scale across multiple parts. The output STL is ready for download and downstream tooling like slicers or CNC workflows.