Mistake 1: Sizing for Current Volume Only
The most common buying mistake is also the most expensive. Buyers look at current demand, add a modest buffer, and buy a machine sized for today plus 10-20%. Eighteen months later, demand has grown 35%, the machine is running 95% utilization, every unplanned stoppage is a crisis, and the factory is forced into either night-shift production at premium labor cost or a second machine purchase earlier than planned.
The right sizing approach is to forecast 36 months out and size the machine for 80% of that forecast. The math: if you currently run 120 units per minute and forecast 180 at 36 months, buy a machine rated for at least 225 units per minute. Why 80% and not 100%? Because no machine runs at 100% of rated speed continuously, and because the buffer gives you capacity to absorb product mix changes and new SKUs without immediately needing another machine.
The cost of getting this wrong is large. A mid-market VFFS costs $80,000 to $150,000. Adding a second line 18 months early because the first is undersized doubles your capital outlay, doubles your floor space requirement, and doubles your maintenance burden. Worse, the second line often arrives 4-6 months after you actually need it, forcing you to outsource production at a 15-25% margin loss during the gap.
The other direction is also a mistake: buying a machine 3x your current volume "because we'll grow into it" wastes capital, increases per-unit fixed cost, and creates a training and maintenance burden on a machine that is running at 30% capacity. The 80% of 36-month forecast rule threads the needle.
Mistake 2: Ignoring Changeover Time
Most buyers fixate on peak throughput and ignore changeover time. This is backwards. On any line running more than 3-4 SKUs, changeover time dominates total output more than peak speed.
Consider two machines. Machine A runs 180 bags per minute with 45-minute changeovers. Machine B runs 160 bags per minute with 15-minute changeovers. On a line running 6 SKUs per shift with one changeover each, Machine A loses 270 minutes per shift to changeovers. Machine B loses 90 minutes. Over an 8-hour shift, Machine B produces more total output despite lower peak speed.
The mistake is asking suppliers "what is your top speed?" instead of "what is your realistic changeover time between these two specific formats?" Changeover time varies by format change. Changing bag length on a VFFS might take 10 minutes. Changing bag style (pillow to gusseted) might take 60 minutes. Get the changeover time for each format transition you actually run, in writing, with the supplier committing to the number.
The cost of ignoring changeover: a machine that looks 15% faster on paper produces 10-20% less in reality. Over 10 years, that is hundreds of thousands of units of lost output. For a deeper framework on evaluating suppliers against this and other mistakes, see our 20 questions guide.
Mistake 3: Underestimating Training Needs
A new packaging machine represents new control systems, new HMI logic, new fault codes, and new maintenance procedures. Standard supplier training is 3-5 days on-site for operators and 2-3 days for maintenance. This is not enough.
Realistic training needs for a new mid-market machine: 5-7 days initial operator training, 3-5 days initial maintenance training, a follow-up training session at 60-90 days to address issues that emerged during early production, and a refresher at 6 months. Total: 12-18 days of training over the first year. Cost at $800-$1,200 per day: $10,000-$22,000.
Most buyers budget the supplier's included training and nothing more. The result: operators learn 60-70% of what they need in the first month, run with bad habits for the next 6 months, and the machine never reaches its potential OEE. The maintenance team learns enough to clear basic jams but not enough to troubleshoot complex faults. Service calls pile up for issues the team should have resolved internally.
The fix: budget 3-5% of purchase price for training over the first 24 months. Include initial training, follow-up training, off-site training at the supplier's facility, and training for new hires as the team turns over. Document the training plan in the purchase contract. A supplier that wants your business will include additional training at reasonable cost.
Mistake 4: Skipping the Factory Acceptance Test
The factory acceptance test (FAT) is the single most powerful protection a buyer has against a non-performing machine. Skipping FAT to save travel cost and time is the costliest mistake in this list.
At FAT, the buyer visits the supplier's factory before shipment and runs the machine with actual product for 4-8 hours. The team measures sustained throughput, scrap rate, changeover time, and validates that the machine meets specification. If anything fails, the supplier fixes it before shipment. If the machine passes, the buyer signs acceptance and authorizes shipment.
Without FAT, the supplier ships the machine, you discover issues during installation, and now you are negotiating fixes with a supplier who already has most of your money. The supplier has every incentive to minimize the issue. You have very little leverage. The 2-3 days and $5,000-$10,000 of travel cost for a FAT pays back many times over.
The FAT should be specified in the contract: duration, product and materials supplied by buyer, performance criteria, and the consequence of failing FAT (typically: supplier remedies at their cost before shipment, and final payment is held until FAT passes). Never accept a contract that allows shipment without FAT.
Mistake 5: Buying on Price Alone
Purchase price is 60-75% of total cost of ownership over 10 years. The other 25-40% comes from installation, training, energy, spare parts, software licensing, and major overhauls. A 25% lower purchase price can become a 10-15% higher TCO when the other categories are included.
We see this pattern frequently. A factory shortlists three suppliers: $120,000, $145,000, and $180,000. Procurement pushes for the $120,000 option. The $120,000 machine arrives with cheaper wear parts that need replacing every 6 months instead of every 18 months ($4,000/year additional), a less efficient motor drawing 30% more power ($8,000/year additional), and software licensing that costs $2,500/year versus $800/year for the mid-tier option. Over 10 years, the $25,000 purchase price savings become a $40,000-$60,000 TCO penalty.
The fix: require each shortlisted supplier to provide a 10-year TCO estimate with the same line items in the same format. Compare TCO, not purchase price. If a supplier refuses to provide TCO, remove them from the shortlist. The TCO estimate is also useful for internal capital approval because it shows finance the full picture.
For the underlying TCO model, see the Machine Selector pillar.
Mistakes 6-10: Maintenance, Parts, Service, Software, Integration
The remaining five mistakes cluster around what happens after the machine arrives. Each one alone is survivable. Together, they are what turn a promising purchase into a five-year headache.
Mistake 6: Inadequate maintenance planning. New machines need preventive maintenance and the supplier's PM schedule is the starting point, not the ending point. Common failures: not ordering a starter spares kit at purchase (the kit costs 5-8% of machine price and covers wear parts for 12-18 months, ordering it later means lead times and downtime), not setting up a CMMS for the new machine within 60 days (intervals slip without a tracking system), not assigning a dedicated maintenance lead (a new machine needs an owner, not rotating responsibility), and not scheduling the first major PM at 6 months (this catches early wear issues the supplier's standard schedule often skips). Budget 3-8% of purchase price annually for PM, depending on machine complexity and shift pattern. Mechanical-heavy machines on three shifts need 6-8%. Modern servo-driven machines on single shift need 3-4%.
Mistake 7: No parts strategy. Parts strategy is the difference between a 4-hour line-down event and a 4-week line-down event. Common failures: assuming the supplier stocks parts locally without verifying fill rate and lead time in writing, not identifying critical spares (some parts have 8-12 week lead times and must be ordered at purchase), not negotiating consignment stock for high-value low-turnover parts, and not building a parts min-max reorder system. The right strategy varies by machine criticality. Single-shift non-critical lines tolerate 60% fill rate. Three-shift lines shipping daily need 90%+ fill rate and critical spares on-hand.
Mistake 8: Inadequate service contract. Most buyers take the standard warranty and hope for the best. This works until the machine goes down at 2am on a Saturday and the service engineer cannot arrive until Tuesday. The fix is a negotiated service contract with: response time guarantee (4-8 hours for remote diagnostics, 24-48 hours for on-site), parts shipment guarantee (24-72 hours from local depot), annual PM visit (1-2 days), and discounted labor rates. Service contracts cost 4-8% of machine price annually but pay back through faster issue resolution and extended machine life.
Mistake 9: Software and connectivity gaps. Modern machines run on licensed software with annual update fees and connect to MES and ERP via OPC-UA, EtherNet/IP, or proprietary protocols. Common failures: not budgeting 1-3% of machine price annually for software licensing, not verifying connectivity with existing systems (get the protocol spec and test compatibility), not understanding the HMI update path (some suppliers charge for updates, others include them), and not negotiating source code escrow (if the supplier goes out of business, you lose software support). Software costs are the most underestimated category in packaging machine TCO.
Mistake 10: Poor integration planning. A new machine connects to upstream dosing, downstream checkweighers, metal detectors, case packers, and palletizers. Integration is where timelines slip and budgets overflow. Common failures: bringing the controls engineer in after contract signature, not specifying who owns each integration interface, not budgeting for controls programming and mechanical modifications to adjacent equipment, and not allowing integration testing time during commissioning. The fix: bring controls engineering and the production supervisor into the spec phase, map every integration point with ownership and budget, plan 2-4 weeks for integration work during commissioning separate from the supplier install timeline, and budget 10-20% of machine price for integration.
For a deeper evaluation of suppliers that addresses these mistakes systematically, see the 20 questions framework and the brand comparison.
Pre-Purchase Checklist: 15-Item Go/No-Go
Before signing the purchase order, work through this 15-item checklist. Any item that cannot be checked off is a reason to pause.
- Machine sized for 80% of 36-month forecast volume, not current volume.
- Changeover time committed in writing for each format transition.
- Realistic sustained throughput quoted for your specific product, not rated speed.
- Training budget of 3-5% of purchase price over 24 months, documented in contract.
- FAT specified in contract with performance criteria and remedies for failure.
- 10-year TCO estimate provided by supplier and compared across shortlist.
- Preventive maintenance schedule provided in hours and dollars.
- Spare parts starter kit ordered with machine, 5-8% of purchase price.
- Parts fill rate and lead time from local depot committed in writing.
- Service contract negotiated with response time and parts shipment guarantees.
- Software licensing structure documented, including annual fees and update path.
- Connectivity protocol specified and verified compatible with existing systems.
- Three references in your region running this model for over 18 months, contacted.
- Integration plan documented with ownership for each handshake point.
- Controls engineer and production supervisor have signed off on the spec.
If all 15 items check off, you have done the work that separates packaging machine purchases that succeed from those that become regret. If 2-3 items are missing, fix them before signing. If 5 or more items are missing, the purchase is not ready regardless of how attractive the price looks.
The cost of completing this checklist is 20-40 hours of work over 4-6 weeks. The cost of skipping it: a machine that underperforms for 10-15 years. Start the evaluation with the Machine Selector and use the 20 questions to pressure-test each shortlisted supplier.