The fastest way to figure out whether your current gang-sheet workflow is pulling its weight is the same thing every honest manufacturing process uses: measure the output, compare it to what’s possible, decide if the gap is worth closing.
You do not need new software to run this audit. You need five minutes, a ruler, and a printed sheet from a typical mixed order.
Step 1 — pick a real job, not a demo
Gang-sheet layouts look deceptively efficient on uniform rectangles. Real orders are messy: different rotations, a couple of circular logos, a handful of thin horizontal pieces, one oddly-shaped back print. That’s the job you need to audit, because that’s the job where packing quality actually matters.
Pull up a recent order where:
- The piece mix was varied (not all one size)
- The sheet hit at least one usable size limit (width, typically)
- You remember it taking more than one sheet to fit
That’s a representative order.
Step 2 — measure productive area
Get the printed sheet in front of you (or the export, if you still have it). You need two numbers:
- Total sheet area — the paper area you paid for. For a standard 60 cm × 100 cm sheet that’s 6 000 cm².
- Productive area — the sum of the piece bounding boxes actually used. If you have a CSV of order lines with piece dimensions, add up width × height across them. If you don’t, measure six or seven representative pieces with a ruler and multiply by the count of each size.
Take productive ÷ total. That ratio is your utilisation.
Step 3 — score it
A rough bench for what different utilisation numbers mean:
- Below 70 % — packing is probably manual or using a tool that only places items in rows. You are paying for film you’re not using on every sheet. Easiest money in the building to recover.
- 70 % to 80 % — a decent automated tool doing the obvious work. Fine for uniform orders, but wasting on any mixed-rotation job.
- 80 % to 88 % — a good packer that handles rotation and starts fitting small pieces into gaps. This is roughly the best most packing tools achieve.
- Above 90 % — a purpose-built gang-sheet packer that understands rotation, nesting, and last-fit optimisation. Worth chasing for any shop running more than five sheets a day.
For context, a skilled operator can hit 90 %+ manually on a simple job and about 75 % on a complex one, because manual placement runs out of attention before it runs out of gaps. Automation that beats a skilled operator on a hard job is the inflection point where tooling pays for itself.
Step 4 — do the math
How much is the gap costing you?
Annual film waste = sheets_per_year × sheet_area × (1 − utilisation) × film_cost_per_m²
> Plug in your own numbers — the example below assumes **$25 / m² film**, but substitute what you actually pay (many shops are closer to $18, some premium films are $35+). The waste scales linearly with cost, so the gap between a 70 %-packed sheet and a 94 %-packed sheet is always **the same fraction of your total film spend**, whatever that spend is.For a shop running 15 sheets per day (roughly 3 900/year), 60 × 100 cm sheets, film at 25 USD/m²:
- At 70 % utilisation — 3 900 × 0.6 × 0.30 × 25 = 17 550 USD/year of film buying nothing.
- At 85 % utilisation — 3 900 × 0.6 × 0.15 × 25 = 8 775 USD/year.
- At 94 % utilisation — 3 900 × 0.6 × 0.06 × 25 = 3 510 USD/year.
The gap between 70 % and 94 % — the gap between manual-ish and purpose-built — is about 14 000 USD/year on that volume. A workflow change that closes half of that gap pays for itself in the first month.
What good packing actually looks like
The visible tells of a well-packed sheet:
- Long edges of pieces align to the sheet edge — the packer recognised the sheet’s tight dimension and oriented for it, instead of leaving a corridor.
- Small pieces are inside the gaps between big pieces — not sitting in a neat grid at the bottom. A grid at the bottom means the tool ran out of ideas for the top.
- Rotation is mixed — some pieces at 0°, some at 90°, occasionally 180° for pieces with thick–thin asymmetry. If every piece is at 0° you are not packing, you are paginating.
- The worst-fit area is the single empty corner, not three scattered gaps — good packers concentrate waste into one place you can measure. Bad packers spread it across the sheet where you can’t.
Take the audit
Run the five-minute version on one of your recent orders this week. If you land above 90 %, your current workflow is doing its job. If you land below 80 %, it’s probably time to try a tool that was built specifically for this problem.
Either way, now you have a number. That alone puts you ahead of most shops in the industry.
