The race to 1,000 parts: when in-house 3D beats molding on the clock — and when it does not
Formlabs pits two Form 4L systems against a real two-cavity mold: hours, dollars, and a break-even point that moves beyond first intuition.
3D versus injection debates are often slogan-level, ignoring tool cost and time-to-first-good-part. “Race to 1,000 Parts” tries to discipline the story with a concrete case — Formlabs’ Resin Mixer Latch, a real production mold, and two Form 4L units competing on net production time.
How the test is set up
The comparison pairs SLA machines with a two-cavity mold already used in production — not a toy model with friendly assumptions.
The source separates production duration, tooling activation lead time, and total cost including amortization — three layers often collapsed into one slide.
Published numbers (and how to read them)
In the published run, molding production time is 6h59 versus 5h56 for 3D — surprising if one assumes the press is always faster once “on”.
Tooling activation is quoted around 4–6 weeks; tool cost in the described case is USD 3,600. At 1,000 parts, roughly USD 3,920 for molding versus USD 600 for internal 3D. Declared break-even moves beyond 13,000 parts.
These are not universal promises — geometry, resin, amortization policy, and internal hourly rates matter. They still dismantle the myth that “molding always wins” in short runs.
What the comparison really teaches
The valuable lesson is economic structure: below a threshold, tooling cost outweighs piece-price advantage — where 3D is a credible production option for short series and frequent revisions.
The source admits molding wins at higher volumes — which makes the story believable.
Practical takeaway
Product roadmaps should gate when a design is stable enough to justify steel — versus staying additive until market evidence arrives.
Source: Formlabs, Race to 1,000 Parts: 3D Printing vs. Injection Molding.
Source date: December 11, 2024