Rectangular shim in C-channel gap F · F1 · f1-shim-gap-01

Prompt

Reference images of a C-channel bracket are attached. The bracket consists of a bottom plate, a back wall, and a top plate; a horizontal gap runs between the two plates and is open along the +Y, +X, and -X faces. Design a rectangular shim that slides into this gap from the +Y side and fills it vertically.

Requirements:
- Single solid, single-root .vcad.
- The shim's thickness (Z extent) must fit the 8mm gap with 0.1–0.3mm clearance, so a shim 7.7–7.9mm thick.
- The shim must not overlap the back wall: when slid in from +Y, the shim begins at y ≥ 8mm.
- The shim must not exceed the bracket's outer width: X extent ≤ 50mm.
- The shim's depth (Y extent) must be ≤ 32mm so it clears the back wall.
- Wall thickness / minimum dimension ≥ 1.5mm (printability).

Output the shim in the host's coordinate frame: the bracket sits with its corner at the origin, extending to (50, 40, 20). Place the shim so it occupies the gap at z ∈ [6, 14] and y ≥ 8.

Checks

{
  "type": "valid_solid"
}

{
  "type": "interference_volume",
  "host": "host_geometry",
  "max_mm3": 1
}

{
  "type": "contact_area",
  "host": "host_geometry",
  "epsilon_mm": 0.3,
  "min_mm2": 800
}

{
  "type": "envelope",
  "max_mm": [
    50.5,
    32.5,
    8
  ]
}

{
  "type": "mate_clearance",
  "host": "host_geometry",
  "min_mm": 0.05,
  "max_mm": 0.5
}

{
  "type": "dfm",
  "rules": [
    "min_wall_1.5mm",
    "no_undercut"
  ]
}

Anti-cheese

{
  "max_solid_count": 1,
  "min_accessory_volume_mm3": 100
}

Limits

{
  "max_tokens": 60000,
  "max_wallclock_sec": 240,
  "max_tool_calls": 60
}

Runs (0)

generated 2026-06-17T03:16:07.282Z · static site, regenerate with npm run build -w @mecheval/leaderboard