This page turns a GeoJSON boundary into a 3D-printable model and lets you download it as an STL. It renders a convex hull + internal line cuts, then builds a solid via extrusion/CSG.

• Edit parameters (URL, simplify values, depth/width).
• Click Create to save settings and reload.
• Use mouse/touch in the 3D view: drag to orbit, scroll/pinch to zoom.
• Click Download STL and import into your slicer (PrusaSlicer/Cura) for 3D printing.