Quick answer: The protective case customization process is not the default answer. Under 300 units a year, a cavity longer than 800 mm, or a need that only resists scratches rather than crush, an off-the-shelf case with a cut liner, a sheet-metal box or a soft bag costs less and ships in 12 days instead of 68.
Table of contents
- The Process Is Not the Default
- Four Lines That Decide the Tool
- What the Alternatives Really Cost
- Where the Process Still Wins
- FAQ
1. The Process Is Not the Default
Most enquiries open with a sentence about cutting a new mould. In four projects out of ten that reflex is wrong: a 26,000 CNY tool over 200 units a year puts 130 CNY into every case before one is moulded.
Do the plain arithmetic before entering the protective case customization process. The device is 480 mm long, ships 180 units a year, travels by box van, and the drop risk sits at loading. An off-the-shelf 600 × 400 × 230 mm case with an EVA liner covers it: 900 CNY for the cutting die, 12 days to delivery.
| Requirement | New tool? | Better route | What it saves |
|---|---|---|---|
| Under 200 units a year | No | Stock case plus EVA liner | 56 days, zero tooling |
| Cavity over 800 mm | Careful | Sheet metal or modular box | 40 percent of tool cost |
| Scratch and dust only | No | Soft bag or blow-moulded case | Unit cost down to a quarter |
| Three-part assembly | Yes | Moulded case, one-piece liner | Half the assembly hours |
| IP67 plus stacking | Yes | Moulded case, double-lip seal | No substitute |
The second row is the one buyers of the protective case customization process miss most. Past 800 mm the press moves from 650 to 1,300 tonnes, the tool doubles and fewer plants quote.
2. Four Lines That Decide the Tool
No specialist is needed. Four lines settle it on paper, and ticking them off beats three meetings.
The four lines that decide whether the protective case customization process starts at all:
- Volume: 300 units a year is the break; below it, tooling exceeds 30 percent of unit cost
- Size: any cavity side past 800 mm lifts both steel weight and press tonnage
- Liner: changing foam only means a 900 CNY die and 12 days, the cheapest form of customising
- Lead time: 68 days for a new tool, 12 for a new liner, 5 for stock, counted backwards from install
Hit two and the tool can wait. Volume is the hard line because tooling is amortised per unit. Size is the hidden line, invisible until the press cannot take the block.
Lead time is the line most often miscalculated: a September install and a June specification push delivery into October.
3. What the Alternatives Really Cost
An alternative to the protective case customization process is not a downgrade. It is a different load path: a stock case with liner absorbs through wall and foam, sheet metal resists by stiffness, a soft bag spreads stress by deforming.
| Route | Unit cost | MOQ | Lead time | Weight | Fits when |
|---|---|---|---|---|---|
| Moulded custom case | 420 CNY | 300 | 68 days | 6.3 kg | Sealing, stacking, repeat orders |
| Stock case plus liner | 260 CNY | 1 | 12 days | 2.4 kg | One device, low annual volume |
| Sheet-metal box | 680 CNY | 20 | 25 days | 9.8 kg | Shielding, heat, frequent access |
| Soft bag | 95 CNY | 50 | 10 days | 0.9 kg | Carry-on, scratch and dust only |
Sheet metal pays for rigidity in weight. A 1.2 mm cold-rolled shell with a frame weighs 9.8 kg empty, needs two people, and wants a trolley between floors. It buys a lid that opens for service, welded internal brackets, and shielding if needed. A soft bag sits at the other end: 0.9 kg on one shoulder, but 15 mm EPE stops scratches and nothing else, and two stacked bags crush the lower one.
The stock case with liner is where most projects land: 260 CNY, one unit minimum, 12 days, liner cut to ±1.5 mm. Its ceiling is sealing and stacking.
4. Where the Process Still Wins
Three conditions have no cheaper substitute. The first is a multi-part fit: three devices locating against each other at ±1.5 mm, which only a one-piece liner can hold.
The second is sealing. IP67 means holding 0.3 bar for 30 seconds with no bubble, which depends on a double-lip gasket and a flat rim; a stock case with a single lip cannot get there. The third is stacking and lifting: 32 kg per case, four high, means the side wall is designed against 128 kg of static load and the ribs follow the load path.
Meet any one of the three and the protective case customization process has no bargain substitute. Meet none, and a new tool turns a simple problem into an expensive one.
Conclusion
Ask three questions before the tool is cut: is annual volume above 300, is the cavity longer than 800 mm, and is sealing or stacking a hard requirement. Three noes mean a stock case with liner, sheet metal or a soft bag will do, and 68 days becomes 12. Only where nothing else solves the problem does the protective case customization process earn its cost.
This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.
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