Security, Fire & Life Safety Products worked example

Enclosure Molding Cost at 99% cavity good-part rate: a worked example

Push cavity good-part rate up to 99% and the picture changes. This example computes every intermediate figure at that operating point. A molder running flame-rated housings uses this to price a production lot after accounting for startup scrap and reject rate.

The inputs for this scenario

  • Enclosures molded: 5,000 shots (unchanged)
  • Resin + cycle cost: 1.85 $/shot (unchanged)
  • Cavity good-part rate: 99 % (raised for this scenario; the documented default is 97)
  • Tool change & startup scrap: 650 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Total = shots x resin & cycle cost x good-part rate% + tool startup) to the inputs above produces each figure below.
  • At this operating point the engine returns 9,808 $ for total enclosure molding cost, the number this scenario is built around.
  • At this operating point the engine returns 1.96 $ / piece for enclosure molding cost per unit.
  • At this operating point the engine returns 9,158 $ for variable enclosure molding cost.
  • At this operating point the engine returns 650 $ for fixed enclosure molding cost adder.

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 1.92% above the baseline at 9,808 $.
  • 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. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Total enclosure molding cost: 9,808 $ (headline result)
  • Enclosure molding cost per unit: 1.96 $ / piece
  • Variable enclosure molding cost: 9,158 $
  • Fixed enclosure molding cost adder: 650 $

Run it with your numbers

  • Every input above is editable in the live Enclosure Molding Cost calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.