Rotational Molding worked example
Resin Cost Per Part at 92% usable resin yield: a worked example in rotational molding
This scenario runs the resin cost per part calculation on the strong side: 92% usable resin yield, with every other input held at its documented default. Use it when resin cost per part in rotational molding is being put through a rotational molding weighted-cost review.
The inputs for this scenario
- Parts molded in the run: 100 units (unchanged)
- Resin charge cost per part: 45 $ / unit (unchanged)
- Usable resin yield (net of scrap/flash): 92 % (raised for this scenario; the documented default is 80)
- Fixed run cost (setup, purge, changeover): 250 $ (unchanged)
Working through the calculation
- Applying the documented formula (Resin Cost Per Part cost = quantity × rate × capture factor + fixed cost) to the inputs above produces each figure below.
- At this operating point the engine returns 4,390 $ for weighted cost, the number this scenario is built around.
- At this operating point the engine returns 43.9 $ / piece for per piece value.
- At this operating point the engine returns 4,140 $ for captured value.
- At this operating point the engine returns 250 $ for fixed adjustment.
How this compares with the baseline
- Against the tool's baseline example, where usable resin yield sits at 80% and the headline result is 3,850 $, this scenario comes in 14.03% above the baseline at 4,390 $.
- Use it when quoting a rotomolded part or re-costing an existing job after a resin price change. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.
Results at a glance
- Weighted cost: 4,390 $ (headline result)
- Per piece value: 43.9 $ / piece
- Captured value: 4,140 $
- Fixed adjustment: 250 $
Run it with your numbers
- Every input above is editable in the live Resin Cost Per Part calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.