Read the cooling timer on five running jobs, and measure the thickest wall of each part.
Work out the time each wall needs with the standard cooling formula, using the plastic's own figures from its data sheet.
Then set the two times side by side for each job.
Cost
About $52, all of it time: about an hour of a process technician, at $52 per hour. Nothing is bought, and no press stops.
Duration
About an hour, while the presses run
Confirmed if
At least one timer runs a quarter or more past the time its wall needs. A thin part with as long a timer as a thicker part of the same plastic shows it too.
Ruled out if
No timer runs past the time its wall needs.
The timers were then already trimmed, and there is nothing here to save.
Where a timer sits in between, a trial on one job decides.