908cfbc981
The 20% infill assumption ignored walls and solid layers which dominate most prints. Validated against Bambu Lab Studio for a GF lid: model volume 26.09 cm³ × 0.50 × 1.24 g/cm³ = 16.2 g (actual: 16.24 g) 16.2 g / 32 g/h × 60 = 30 min (actual: 30.5 min) New env vars (read at request time, no rebuild needed): MATERIAL_FACTOR=0.50 fraction of model volume that becomes filament PRINT_SPEED_G_PER_HOUR=32 matches Bambu Lab at normal quality Card header now shows active assumptions including speed. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
59 lines
2.1 KiB
Python
59 lines
2.1 KiB
Python
"""Job cost and time estimation from STL geometry."""
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import os
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# g/cm³ per material
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_DENSITY: dict[str, float] = {
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"PLA": 1.24,
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"PETG": 1.27,
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"ABS": 1.04,
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"ASA": 1.07,
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"TPU": 1.20,
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"Nylon": 1.14,
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"PC": 1.20,
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}
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_DEFAULT_DENSITY = 1.24
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def estimate(volume_ccm: float, material: str | None) -> dict:
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"""
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Returns a cost/time estimate dict for one job.
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MATERIAL_FACTOR (env, default 0.50):
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Fraction of model volume that becomes actual filament.
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'20 % infill' in the slicer does NOT mean 20 % of volume is printed —
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walls, top/bottom solid layers, and shells are 100 % solid and typically
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dominate. Empirically ~50 % of model volume is printed for typical FDM
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parts (validated against Bambu Lab Studio output).
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PRINT_SPEED_G_PER_HOUR (env, default 32):
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Average material throughput in g/h. ~32 g/h matches Bambu Lab printers
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at normal quality; slower printers (~20 g/h) can be set here.
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"""
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vat_rate = float(os.environ.get("VAT_RATE", 19))
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price_per_kg = float(os.environ.get("FILAMENT_PRICE_PER_KG", 15))
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material_factor = float(os.environ.get("MATERIAL_FACTOR", 0.50))
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print_speed = float(os.environ.get("PRINT_SPEED_G_PER_HOUR", 32))
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density = _DENSITY.get(material or "", _DEFAULT_DENSITY)
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material_ccm = volume_ccm * material_factor
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weight_g = material_ccm * density
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print_minutes = round((weight_g / print_speed) * 60)
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filament_cost = weight_g / 1000 * price_per_kg
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after_misprint = filament_cost * 1.20
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net_price = after_misprint * 1.30
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gross_price = net_price * (1 + vat_rate / 100)
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return {
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"material_ccm": round(material_ccm, 2),
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"weight_g": round(weight_g, 1),
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"print_minutes": print_minutes,
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"filament_cost": round(filament_cost, 2),
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"net_price": round(net_price, 2),
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"gross_price": round(gross_price, 2),
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"vat_rate": vat_rate,
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"price_per_kg": price_per_kg,
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"material_factor": material_factor,
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"print_speed": print_speed,
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}
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