partforge

Nema17 face mount

hard tier · create

The request

Make a face-mount plate for a NEMA 17 stepper motor. A 60 mm square plate, 5 mm thick, lying flat in the XY plane and centred on the origin with Z up. Cut a 22.4 mm through-hole at the centre for the motor's pilot boss, and four 3.4 mm through-holes on the motor's 31 mm square bolt pattern, at X = ±15.5 and Y = ±15.5. Name the sub-part exactly `plate`.

What the AI judge checks

  • A flat square plate of uniform thickness
  • One large round hole at the centre of the plate
  • Four small round holes arranged on a square around the centre hole
  • The four holes are symmetric about both centre lines of the plate
  • Nothing on the plate beyond the five holes

Measured checks

  • one sub-part named plate (gate)
  • plate is 60 × 60 × 5
  • pilot bore is 22.4 mm
  • bolt hole at (15.5, 15.5) is 3.4 mm (gate)
  • bolt hole at (15.5, -15.5) is 3.4 mm (gate)
  • bolt hole at (-15.5, 15.5) is 3.4 mm (gate)
  • bolt hole at (-15.5, -15.5) is 3.4 mm (gate)

Ranked by hand

One reviewer put one attempt from each model in order, best first, ties left tied.

  1. #1 tie
    Gemini 3.8 Flash
    Gemini 3.8 Flash's ranked attempt
  2. #1 tie
    GPT-5.6 Sol
    GPT-5.6 Sol's ranked attempt
  3. #1 tie
    GPT-6 Astra
    GPT-6 Astra's ranked attempt
  4. #1 tie
    Opus 5
    Opus 5's ranked attempt
  5. #1 tie
    Fable 5.1
    Fable 5.1's ranked attempt

Ordering by hand decides Human rank and Human rate on the leaderboard; it never affects Overall or Strict.

Every model's attempts

Run baseline-2026-092026-09-10commit 41aec7daspend $339.70 + $48.02 AI judging, 7 unpricedOther runs: 2026-09-04T20-02-10-stage2-hard-cases, 2026-09-04T19-48-31-screen-14-fixed