What is the minimum order for short-run injection molding?

Most shops set a practical MOQ around 250–500 units so the tool investment amortizes. OPEX has no MOQ — you can order a single production-grade part.

Is short-run injection molding cheaper than 3D printing?

Only above the break-even point (~500–1,000 units of a fixed design). Modern industrial digital manufacturing on OPEX uses production-grade thermoplastics and is cheaper on total landed cost below that threshold.

How long does short-run injection molding take?

2–4 weeks for tooling plus a first-article cycle — usually 3–5 weeks to first shipped parts. OPEX ships in days.

Guide · Manufacturing

Short-Run Injection Molding vs. OPEX

Q: What is short-run injection molding?

Short-run injection molding produces roughly 100–5,000 plastic parts on inexpensive aluminum or MUD-frame tooling. It bridges prototype quantities and production, but still requires a physical mold and a design freeze.

Short-run injection molding fits 100–5,000 parts. Below ~1,000 units of a frozen design, it's almost always the wrong economics. Here's the honest math.

What is short-run injection molding?

Short-run injection molding covers batches of roughly 100 to 5,000 plastic parts. Shops keep tooling costs down with aluminum, MUD (Master Unit Die) frames, or shared bases so the fixed tool bill is closer to $5k–$15k than the $30k+ typical of soft-steel production tools.

It's a real category — used for pilot production, bridge tooling, and market tests. It's also the category most vulnerable to modern digital manufacturing, because the tool cost is a large share of total landed cost at these quantities.

The break-even math

A typical short-run quote looks like: $8,000 tool + $3.50 per part. For a 500-unit batch that's $9,750 total, or $19.50 per landed part. OPEX prices the same geometry at a flat per-unit cost with no tool bill. On most parts, OPEX comes in lower until volumes cross ~1,000 units of a frozen design.

Volume	Short-run molding	OPEX
100 parts	~$83 landed / part	Cheaper
500 parts	~$19.50 landed / part	Usually cheaper
1,000 parts	~$11.50 landed / part	Break-even
5,000 parts	~$5.10 landed / part	Molding wins on unit cost

Illustrative — real numbers depend on part complexity and material. Use our ROI calculator for your specific case.

Zero-MOQ manufacturing

The single biggest structural difference is that OPEX has no minimum order. Ordering ten parts uses the same industrial process as ordering ten thousand — no tool to amortize, no minimum run to cover. That matters more than the per-unit math for anyone who doesn't yet know their real demand curve.

Short-run: 250–500 unit practical MOQ.
OPEX: 1 unit to 10,000 units, same flow.

Where OPEX wins outright

Field pilots and validation runs where you may need a revision in 30 days.
Spares and service parts with unpredictable demand.
Configurable products with per-unit geometry variation.
Bridge production while a hardened tool is still being cut.

Frequently asked questions

What is short-run injection molding?

Batches of 100–5,000 parts on inexpensive aluminum or MUD tooling. Bridges prototypes and production but still requires a mold and a design freeze.

What's the minimum order?

Most shops set ~250–500 units to make the tool pay off. OPEX has no MOQ.

Is it cheaper than 3D printing?

Only above ~500–1,000 units. Modern industrial digital manufacturing on OPEX beats short-run molding on total landed cost below that.

How long does short-run molding take?

3–5 weeks to first parts. OPEX ships in days.

No tool. No MOQ. Just parts.

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