Overall bbox 143 x 149 x 18.5 mm (X -71.5..71.5, Y -71.5..77.5, Z -0..18.5); total volume 168006 mm^3; 3 part(s)
- base: 1 solid(s), 141 faces, valid; size 143 x 143 x 18.5; bbox X -71.5..71.5 Y -71.5..71.5 Z -0..18.5; volume 128169 mm^3
    thinnest wall ~1.6 mm at (-67.6, -0.755, 16.9)
    rounded-edge radii: 6
    ! 2 free edge(s) on a solid part
- lid: 1 solid(s), 10 faces, valid; size 135.4 x 145.2 x 2; bbox X -67.7..67.7 Y -67.7..77.5 Z 14.7..16.7; volume 39313.3 mm^3
    thinnest wall ~2 mm at (14.0608, -10.301, 14.7)
    rounded-edge radii: 2
- marble: 1 solid(s), 1 faces, valid; size 10 x 10 x 10; bbox X -65..-55 Y -65..-55 Z 2.6..12.6; volume 523.599 mm^3
    thinnest wall ~10 mm at (-63.2143, -59.0728, 11.316)
    ! 2 free edge(s) on a solid part
Clearances: base<->lid 0.2 mm, base<->marble 0.3 mm, lid<->marble 2.1 mm
Checks (verify):
  [PASS] every cell reachable (perfect maze): 81 (expected 81 ±0.01)
  [PASS] passages = cells - 1: 80 (expected 80 ±0.01)
  [PASS] solution length (cells): 56
  [PASS] corridor clear width: 13 (expected >= 12)
  [PASS] walls tall enough to guide marble: 10.5 (expected >= 8)
  [PASS] lid above marble top: 11.2 (expected >= 10.5)
  [PASS] lid does not overlap base: 0 (expected 0 ±0.001)
  [PASS] lid clears walls/groove: 0.2 (expected >= 0.15)
  [PASS] marble does not overlap base: 0 (expected 0 ±0.001)
  [PASS] fits a 220 mm bed: 143 (expected <= 220)
  [PASS] base is one solid: 1 (expected 1 ±0.01)
  [PASS] thinnest wall: 1.6 (expected >= 1)
Bill of materials:
  1. base x1 (-, 128169 mm^3)
  2. lid x1 (-, 39313.3 mm^3)
  3. marble x1 (-, 523.6 mm^3)