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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 |
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+# 2. Circular Flange With Bolt-Hole Pattern
+
+![Circular flange orbit gif](benchmark_02_circular_flange.gif)
+
+## Prompt
+
+Create a single solid circular flange as a STEP model in millimeters. The flange is a cylinder with an outside diameter of 80 mm and a thickness of 10 mm. Its axis is vertical along Z, with the bottom face at Z = 0 and the center at X = 0, Y = 0.
+
+Add a central vertical through-bore with diameter 30 mm.
+
+Add six equally spaced vertical through-holes, each 6 mm in diameter, on a 60 mm bolt-circle diameter.
+
+Add a 1.5 mm fillet to the top and bottom outside circular edges.
+
+Export as a STEP file.
+
+## Test Cases
+
+| Test | Expected result |
+| --- | --- |
+| STEP import | File imports successfully |
+| Solid count | Exactly one watertight solid |
+| Outer diameter | 80 mm |
+| Thickness | 10 mm |
+| Central bore | Diameter 30 mm vertical through-hole |
+| Coaxiality | Central bore coaxial with flange outer cylinder |
+| Bolt-hole count | Six |
+| Bolt-hole diameter | 6 mm each |
+| Bolt circle | Hole centers lie on 60 mm diameter circle |
+| Angular spacing | 60 degrees between adjacent bolt holes |
+| Fillets | 1.5 mm fillets on top and bottom outside circular edges |
+| Negative check | No missing bolt holes; no misplaced non-circular holes; no extra patterns |
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+# 3. L-Bracket With Gussets and Two Hole Directions
+
+![L-bracket orbit gif](benchmark_03_l_bracket.gif)
+
+## Prompt
+
+Create a single solid L-bracket STEP model in millimeters.
+
+The bracket has a horizontal base plate 80 mm long in X, 50 mm wide in Y, and 8 mm thick in Z. Center the base plate on the XY origin, with its bottom at Z = 0.
+
+Add a vertical back plate along the rear long edge of the base. The back plate is 80 mm long in X, 8 mm thick in Y, and 50 mm tall in Z, rising from the top of the base plate. The back plate should sit along the rear edge at positive Y.
+
+Add two vertical through-holes in the base plate, each 6 mm in diameter, located at X = +/-25 mm and Y = -10 mm.
+
+Add two horizontal through-holes in the vertical plate, each 6 mm in diameter, located at X = +/-25 mm and Z = 30 mm, passing through the 8 mm thickness of the vertical plate.
+
+Add two triangular gussets, each 8 mm thick in X, located at X = +/-20 mm. Each gusset should connect the base plate to the back plate with a right-triangle side profile 30 mm tall and 30 mm deep.
+
+Add 2 mm fillets to the outside corner where the base and back plate meet.
+
+Export as a STEP file.
+
+## Test Cases
+
+| Test | Expected result |
+| --- | --- |
+| STEP import | File imports successfully |
+| Solid count | Exactly one fused watertight solid |
+| Base dimensions | 80 x 50 x 8 mm |
+| Back plate dimensions | 80 x 8 x 50 mm |
+| Back plate placement | Along positive-Y rear edge of base |
+| Base hole count | Two |
+| Base hole geometry | 6 mm diameter vertical through-holes |
+| Base hole locations | X = +/-25 mm, Y = -10 mm |
+| Back hole count | Two |
+| Back hole geometry | 6 mm diameter horizontal through-holes through Y thickness |
+| Back hole locations | X = +/-25 mm, Z = 30 mm |
+| Gusset count | Two |
+| Gusset geometry | Right-triangle side profile, approximately 30 x 30 mm |
+| Gusset placement | At X = +/-20 mm |
+| Fillets | 2 mm fillets at base/back outside transition |
+| Negative check | No floating gussets; no unfused plates; holes must actually cut through |
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+# 4. Stepped Shaft With Keyway
+
+![Stepped shaft orbit gif](benchmark_04_stepped_shaft_keyway.gif)
+
+## Prompt
+
+Create a single solid stepped shaft STEP model in millimeters.
+
+The shaft axis runs along X. The total length is 120 mm. The left end center is at X = 0, Y = 0, Z = 0.
+
+From X = 0 to X = 30, the shaft diameter is 20 mm. From X = 30 to X = 90, the shaft diameter is 30 mm. From X = 90 to X = 120, the shaft diameter is 20 mm.
+
+Add a 1 mm chamfer to both end edges.
+
+Add a rectangular keyway slot on the top of the 30 mm diameter middle section. The keyway is 6 mm wide in Y, 3 mm deep in Z, and runs from X = 40 to X = 80.
+
+Export as a STEP file.
+
+## Test Cases
+
+| Test | Expected result |
+| --- | --- |
+| STEP import | File imports successfully |
+| Solid count | Exactly one watertight solid |
+| Shaft axis | Along X, not Z |
+| Total length | 120 mm |
+| Left section | Diameter 20 mm, length 30 mm |
+| Middle section | Diameter 30 mm, length 60 mm |
+| Right section | Diameter 20 mm, length 30 mm |
+| Coaxiality | All three cylindrical sections share same X-axis |
+| End chamfers | 1 mm chamfer at both ends |
+| Keyway location | On top of middle section |
+| Keyway length | From X = 40 to X = 80 |
+| Keyway width | 6 mm in Y |
+| Keyway depth | 3 mm downward into shaft |
+| Negative check | Keyway should not pass through the shaft; shaft should not be vertical |
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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 |
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+# 6. Aerospace-Style Clevis Bracket With Lightening Cutouts
+
+![Clevis bracket orbit gif](benchmark_06_clevis_bracket_lightening_cutouts.gif)
+
+## Prompt
+
+Create a single solid aerospace-style clevis bracket as a STEP model in millimeters.
+
+The part is symmetric about the XZ plane.
+
+Start with a base plate 120 mm long in X, 60 mm wide in Y, and 10 mm thick in Z, centered on the XY origin, with bottom face at Z = 0.
+
+Add two vertical clevis lugs rising from the top of the base near the center. Each lug is 18 mm thick in Y, 42 mm tall above the base, and extends 36 mm along X. The two lugs are separated by a 16 mm central gap in Y. The top of each lug has a semicircular rounded profile with radius 18 mm when viewed from the side.
+
+Add a horizontal through-hole of diameter 14 mm through both lugs along the Y direction, centered at X = 0 and Z = 34 mm.
+
+Add four base mounting holes, diameter 7 mm, through the base plate, located at X = +/-45 mm and Y = +/-20 mm.
+
+Add two triangular lightening cutouts through the base web, one on each side of the clevis, each with rounded corners of radius 3 mm.
+
+Add two diagonal reinforcing ribs from the base to the outer faces of the lugs, one on each side, thickness 6 mm.
+
+Add 3 mm fillets to the base perimeter and 2 mm fillets at lug-to-base transitions.
+
+Export as a STEP file.
+
+## Test Cases
+
+| Test | Expected result |
+| --- | --- |
+| STEP import | File imports successfully |
+| Solid count | One watertight fused solid |
+| Symmetry | Symmetric about XZ plane |
+| Base dimensions | 120 x 60 x 10 mm |
+| Lug count | Two |
+| Lug thickness | 18 mm in Y each |
+| Lug height | 42 mm above base |
+| Lug X extent | 36 mm |
+| Lug gap | 16 mm central gap in Y |
+| Lug top profile | Semicircular/rounded top, radius approximately 18 mm |
+| Clevis hole | Diameter 14 mm horizontal through-hole |
+| Clevis hole axis | Along Y |
+| Clevis hole location | Centered at X = 0, Z = 34 mm |
+| Base mounting holes | Four 7 mm diameter vertical through-holes |
+| Base hole locations | X = +/-45 mm, Y = +/-20 mm |
+| Lightening cutouts | Two triangular cutouts through base/web region |
+| Cutout corner radius | Approximately 3 mm rounded corners |
+| Reinforcing ribs | Two diagonal ribs, 6 mm thick |
+| Fillets | 3 mm base perimeter; 2 mm lug-to-base |
+| Negative check | Clevis gap must be open; lugs/ribs must not be detached |
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+# 7. Radial-Engine-Style Cylinder With Cooling Fins
+
+![Radial-engine-style cylinder orbit gif](benchmark_07_radial_engine_cylinder.gif)
+
+## Prompt
+
+Create a single solid radial-engine-style cylinder as a STEP model in millimeters.
+
+The main cylinder axis is vertical along Z and centered at the origin.
+
+Create a central barrel with diameter 36 mm and height 70 mm, bottom at Z = 0.
+
+Around the barrel, add 12 horizontal circular cooling fins. Each fin is 2 mm thick in Z, has outside diameter 62 mm, and is spaced every 5 mm from Z = 10 mm to Z = 65 mm.
+
+Add a thicker base flange at the bottom, outside diameter 70 mm and thickness 8 mm, with six vertical mounting holes of diameter 5 mm on a 56 mm bolt circle.
+
+Add a top cap cylinder, diameter 44 mm and height 8 mm, from Z = 70 mm to Z = 78 mm.
+
+Add an angled spark-plug boss protruding from the side of the top cap. The boss is a cylinder of diameter 12 mm and length 24 mm, angled upward at 35 degrees from horizontal, with its axis pointing outward in the positive X direction.
+
+Add a 5 mm diameter hole through the boss along its own axis.
+
+Add small 1 mm fillets to the outer fin edges and base flange edges.
+
+Export as a STEP file.
+
+## Test Cases
+
+| Test | Expected result |
+| --- | --- |
+| STEP import | File imports successfully |
+| Solid count | One fused watertight solid |
+| Main axis | Vertical along Z |
+| Barrel | Diameter 36 mm, 70 mm tall |
+| Barrel placement | Centered at origin; bottom at Z = 0 |
+| Cooling fin count | 12 |
+| Fin diameter | Diameter 62 mm |
+| Fin thickness | 2 mm each |
+| Fin spacing | Nominally 5 mm from Z = 10 to Z = 65 |
+| Base flange | Diameter 70 mm, 8 mm thick |
+| Mounting hole count | Six |
+| Mounting hole diameter | Diameter 5 mm |
+| Mounting bolt circle | Diameter 56 mm |
+| Mounting hole spacing | 60 degrees between holes |
+| Top cap | Diameter 44 mm, 8 mm tall, Z = 70 to 78 mm |
+| Spark-plug boss | Diameter 12 mm cylinder, 24 mm long |
+| Boss orientation | Points outward in +X direction |
+| Boss angle | 35 degrees upward from horizontal |
+| Boss bore | Diameter 5 mm through-hole along boss axis |
+| Fillets | 1 mm outer fin-edge and flange-edge fillets |
+| Negative check | Boss bore must be coaxial with angled boss; fins must not be missing or merged into one thick cylinder |
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+# 8. Centrifugal Impeller With Backward-Curved Blades
+
+![Centrifugal impeller orbit gif](benchmark_08_centrifugal_impeller.gif)
+
+## Prompt
+
+Create a single solid centrifugal impeller as a STEP model in millimeters.
+
+The impeller axis is vertical along Z and centered at the origin.
+
+Add a circular backplate disk with outside diameter 90 mm and thickness 6 mm, with its bottom face at Z = 0.
+
+Add a central hub cylinder on top of the backplate, diameter 26 mm and height 22 mm above the backplate.
+
+Add a vertical through-bore of diameter 8 mm through the entire part.
+
+Add 12 identical backward-curved blades on top of the backplate, equally spaced around the hub. Each blade begins at radius 18 mm and ends at radius 43 mm. Each blade is 3 mm thick, 16 mm tall above the backplate, and curves backward by approximately 45 degrees from root to tip. The blade tips should lean opposite the direction of rotation when viewed from above.
+
+Add 1 mm fillets at the blade roots where they meet the backplate and hub. Add a 1.5 mm fillet to the top and bottom outer circular edges of the backplate.
+
+Export as a STEP file.
+
+## Test Cases
+
+| Test | Expected result |
+| --- | --- |
+| STEP import | File imports successfully |
+| Solid count | One fused watertight solid |
+| Backplate diameter | Diameter 90 mm |
+| Backplate thickness | 6 mm |
+| Hub diameter | Diameter 26 mm |
+| Hub height | 22 mm above backplate |
+| Through-bore | Diameter 8 mm through entire part |
+| Coaxiality | Backplate, hub, and bore share Z-axis |
+| Blade count | 12 |
+| Blade spacing | 30 degrees between adjacent blades |
+| Blade radial span | Approximately R18 to R43 |
+| Blade height | 16 mm above backplate |
+| Blade thickness | Approximately 3 mm |
+| Blade curvature | Approximately 45 degrees backward from root to tip |
+| Blade fusion | Blades joined to backplate and hub |
+| Fillets | 1 mm blade-root fillets; 1.5 mm backplate edge fillets |
+| Negative check | No straight radial-only blades unless curvature requirement is otherwise approximated; no floating blades |
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+# 9. Spiral Staircase With Helical Handrail
+
+![Spiral staircase orbit gif](benchmark_09_spiral_staircase.gif)
+
+## Prompt
+
+Create a single STEP model of a miniature spiral staircase in millimeters.
+
+The staircase is centered on the origin and rises along Z.
+
+Add a central vertical column, diameter 14 mm and height 140 mm, with its bottom at Z = 0.
+
+Add 20 identical wedge-shaped stair treads arranged helically around the column. Each tread is 4 mm thick, has an inner radius of 10 mm, an outer radius of 62 mm, and subtends 24 degrees in plan view. The first tread is at Z = 4 mm, and each subsequent tread rises by 6 mm and rotates by 18 degrees around Z.
+
+Add a helical outer handrail tube of diameter 5 mm following radius 66 mm, starting at Z = 14 mm and ending at Z = 130 mm, making one full revolution around the staircase.
+
+Add 20 vertical balusters, each diameter 3 mm, connecting the outer end of each tread to the handrail.
+
+Add a circular base disk, diameter 90 mm and thickness 5 mm.
+
+Export as a STEP file.
+
+## Test Cases
+
+| Test | Expected result |
+| --- | --- |
+| STEP import | File imports successfully |
+| Main structure | Valid solid bodies or valid fused assembly |
+| Central column | Diameter 14 mm, 140 mm tall |
+| Column placement | Centered on Z-axis; bottom at Z = 0 |
+| Base disk | Diameter 90 mm, 5 mm thick |
+| Tread count | 20 |
+| Tread thickness | 4 mm |
+| Tread inner radius | R10 mm |
+| Tread outer radius | R62 mm |
+| Tread angular width | 24 degrees |
+| Tread rise | 6 mm per step |
+| Tread rotation | 18 degrees per step |
+| Helical progression | Treads rise and rotate together, not merely radial-patterned flat |
+| Handrail | Diameter 5 mm tube at R66 mm |
+| Handrail vertical range | Z = 14 mm to Z = 130 mm |
+| Handrail revolution | Approximately one full 360-degree turn |
+| Baluster count | 20 |
+| Baluster diameter | Diameter 3 mm |
+| Baluster relation | Each connects tread outer region to handrail |
+| Negative check | No missing rail; no flat circular stair pattern with no rise |
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+# 10. Simplified Planetary Gear Stage
+
+![Planetary gear stage orbit gif](benchmark_10_planetary_gear_stage.gif)
+
+## Prompt
+
+Create a visually clear simplified planetary gear assembly as a STEP model in millimeters.
+
+The assembly lies flat in the XY plane with gear axes along Z. Use separate solid bodies for the sun gear, three planet gears, ring gear, carrier plate, and three planet pins.
+
+All gears are 8 mm thick. Use simplified straight-sided trapezoidal teeth rather than true involute teeth.
+
+The sun gear has 24 external teeth, pitch diameter 48 mm, root diameter 42 mm, and outside diameter 54 mm.
+
+The three planet gears each have 18 external teeth, pitch diameter 36 mm, root diameter 31 mm, and outside diameter 41 mm. Place the planet gear centers on a 42 mm radius circle, equally spaced every 120 degrees.
+
+The ring gear is concentric with the sun gear, has 60 internal teeth, internal pitch diameter 120 mm, internal root diameter 126 mm, internal tooth-tip diameter 114 mm, and outside diameter 140 mm.
+
+Add a thin circular carrier plate below the gears, diameter 105 mm and thickness 4 mm, located from Z = -5 mm to Z = -1 mm.
+
+Add three vertical planet pins, each diameter 6 mm and height 14 mm, centered under the planet gears.
+
+Add a central sun bore of diameter 10 mm.
+
+Export as a STEP file.
+
+## Test Cases
+
+| Test | Expected result |
+| --- | --- |
+| STEP import | File imports successfully |
+| Body count | Separate bodies for sun, 3 planets, ring, carrier, and 3 pins |
+| Gear axes | All gear axes parallel to Z |
+| Gear thickness | 8 mm for sun, planet, and ring gears |
+| Sun tooth count | 24 external teeth |
+| Sun diameters | Pitch approximately 48 mm diameter; root 42 mm diameter; outside 54 mm diameter |
+| Sun bore | 10 mm diameter central through-bore |
+| Planet count | Three planet gears |
+| Planet tooth count | 18 teeth each |
+| Planet diameters | Pitch approximately 36 mm diameter; root 31 mm diameter; outside 41 mm diameter |
+| Planet placement | Centers on R42 mm circle |
+| Planet spacing | 120 degrees apart |
+| Ring gear | 140 mm outside diameter |
+| Ring internal teeth | 60 internal teeth |
+| Ring diameters | Internal pitch approximately 120 mm diameter; internal root 126 mm diameter; tooth-tip 114 mm diameter |
+| Carrier plate | Diameter 105 mm, 4 mm thick, Z = -5 to -1 mm |
+| Pins | Three 6 mm diameter pins aligned with planet centers |
+| Negative check | Ring teeth must face inward; planet gears should not be fused into sun or ring |
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