Security, Fire & Life Safety Products worked example

Enclosure Molding Cost at 70% cavity good-part rate: a worked example

Suppose cavity good-part rate falls to 70%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate injection molding cost for security and fire device enclosures from resin, cycle time, scrap rate, and one-time mold setup.

The inputs for this scenario

  • Enclosures molded: 5,000 shots (held at the documented default)
  • Resin + cycle cost: 1.85 $/shot (held at the documented default)
  • Cavity good-part rate: 70 % (the input this scenario stresses; the baseline uses 97)
  • Tool change & startup scrap: 650 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Total = shots x resin & cycle cost x good-part rate% + tool startup.
  • Total enclosure molding cost works out to 7,125 $ at these inputs, and this is the headline figure for the scenario.
  • Enclosure molding cost per unit works out to 1.43 $ / piece at these inputs.
  • Variable enclosure molding cost works out to 6,475 $ at these inputs.
  • Fixed enclosure molding cost adder works out to 650 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where cavity good-part rate sits at 97% and the headline result is 9,623 $, this scenario comes in 25.95% below the baseline at 7,125 $.
  • It computes total molding cost as shots times per-shot cost adjusted by good-part rate plus fixed startup cost, and divides by shots for a per-enclosure figure. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Total enclosure molding cost: 7,125 $ (headline result)
  • Enclosure molding cost per unit: 1.43 $ / piece
  • Variable enclosure molding cost: 6,475 $
  • Fixed enclosure molding cost adder: 650 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Enclosure Molding Cost calculator, set cavity good-part rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.