verify-feed-hopper.py, ezdxf 1.4.5, files in feed-hopper
OK   hopper: DXF R12 in millimetres, no audit errors
OK   hopper: 16 lines on CUT  16
OK   hopper: four closed panels
OK   hopper panel 1: bottom edge 300  300.000
OK   hopper panel 1: top edge 800 or 600  800.000
OK   hopper panel 1: both seam edges = true corner line 578.792  578.792 / 578.792
OK   hopper panel 1: panel height = 3D slant 522.015
OK   hopper panel 2: bottom edge 300  300.000
OK   hopper panel 2: top edge 800 or 600  600.000
OK   hopper panel 2: both seam edges = true corner line 578.792  578.792 / 578.792
OK   hopper panel 2: panel height = 3D slant 559.017
OK   hopper panel 3: bottom edge 300  300.000
OK   hopper panel 3: top edge 800 or 600  800.000
OK   hopper panel 3: both seam edges = true corner line 578.792  578.792 / 578.792
OK   hopper panel 3: panel height = 3D slant 522.015
OK   hopper panel 4: bottom edge 300  300.000
OK   hopper panel 4: top edge 800 or 600  600.000
OK   hopper panel 4: both seam edges = true corner line 578.792  578.792 / 578.792
OK   hopper panel 4: panel height = 3D slant 559.017
OK   hopper: area and mass match the bill of materials  1,077,332 mm2, 16.90 kg
OK   outlet: DXF R12 in millimetres, no audit errors
OK   outlet: one closed polyline on CUT
OK   outlet: four rectangle edges of 300, matching the hopper bottom  [300.0, 300.0, 300.0, 300.0]
OK   outlet: two equal seam edges = true corner line 217.945  [217.945, 217.945]
OK   outlet: developed round edge = pi x 200 within 0.5  628.299
OK   outlet: area and mass match the bill of materials  150,228 mm2, 2.36 kg
OK   spout: DXF R12 in millimetres, no audit errors
OK   spout: rectangle 250 by pi x 200  628.319 x 250.000
OK   spout blank length matches the outlet's round edge  +0.020
OK   spout: area and mass match the bill of materials  157,080 mm2, 2.46 kg
OK   flange: DXF R12 in millimetres, no audit errors
OK   flange: outside 280 and bore 203
OK   flange bore clears the spout outside diameter 202  0.50 a side
OK   flange: 8 holes on PCD 241.5, equally spaced
OK   flange: holes clear the bore and the outside edge
OK   flange: area and mass match the bill of materials  28,449 mm2, 1.34 kg

Total steel: 23.05 kg
ALL CHECKS PASSED