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+# 1. Rectangular Calibration Block With Four Holes
+
+![Rectangular calibration block orbit gif](benchmark_01_rectangular_calibration_block.gif)
+
+## Prompt
+
+Create a single solid STEP model in millimeters. The part is a rectangular block, 100 mm long in X, 60 mm wide in Y, and 20 mm tall in Z. Center the block on the XY origin, with the bottom face at Z = 0.
+
+Add four vertical through-holes, each 8 mm in diameter, located at X = +/-35 mm and Y = +/-20 mm.
+
+Add a 2 mm chamfer to the top perimeter edges only. Do not chamfer the holes.
+
+Export as a STEP file.
+
+## Test Cases
+
+| Test | Expected result |
+| --- | --- |
+| STEP import | File imports successfully |
+| Solid count | Exactly one watertight solid |
+| Bounding box | 100 x 60 x 20 mm |
+| Block placement | Centered on XY origin; bottom at Z = 0 |
+| Hole count | Four through-holes |
+| Hole diameter | 8 mm each |
+| Hole axes | Parallel to Z |
+| Hole locations | X = +/-35 mm, Y = +/-20 mm |
+| Hole depth | Fully through the 20 mm block |
+| Chamfer | 2 mm chamfer on top outer perimeter only |
+| Negative check | No chamfers on holes; no extra bosses, slots, text, or decorative geometry |