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+# 5. Open-Top Electronics Enclosure With Bosses
+
+![Open-top electronics enclosure orbit gif](benchmark_05_open_top_electronics_enclosure.gif)
+
+## Prompt
+
+Create a single solid open-top electronics enclosure base as a STEP model in millimeters.
+
+The outer shape is a rectangular box 100 mm long in X, 70 mm wide in Y, and 30 mm tall in Z. Center it on the XY origin, with the bottom face at Z = 0.
+
+The enclosure is open at the top. The wall thickness is 3 mm and the bottom floor thickness is 3 mm.
+
+Add four internal cylindrical standoffs rising from the inside floor. Each standoff has an outside diameter of 10 mm and a height of 12 mm above the inside floor. Place the standoffs at X = +/-35 mm and Y = +/-25 mm.
+
+Add a centered blind hole in each standoff, 3 mm in diameter and 8 mm deep from the top of the standoff.
+
+Add 2 mm radius fillets to the four outside vertical corners of the enclosure.
+
+Export as a STEP file.
+
+## Test Cases
+
+| Test | Expected result |
+| --- | --- |
+| STEP import | File imports successfully |
+| Solid count | One solid body representing the enclosure material |
+| Outer dimensions | 100 x 70 x 30 mm |
+| Placement | Centered on XY origin; bottom at Z = 0 |
+| Top condition | Open top, not capped |
+| Wall thickness | 3 mm |
+| Floor thickness | 3 mm |
+| Interior cavity | Correctly hollowed, with continuous walls and floor |
+| Standoff count | Four |
+| Standoff diameter | Diameter 10 mm |
+| Standoff height | 12 mm above inside floor |
+| Standoff locations | X = +/-35 mm, Y = +/-25 mm |
+| Blind hole count | Four |
+| Blind hole diameter | Diameter 3 mm |
+| Blind hole depth | 8 mm from standoff top |
+| Corner fillets | 2 mm radius on four outside vertical corners |
+| Negative check | Blind holes must not break through floor; standoffs must not float |