A 3D printing service turns your CAD file into physical prototype parts in days, with typical costs running from about $10–$50 for a small FDM plastic part to $100–$500 or more for large, high-detail, or engineering-grade parts in SLA, SLS, or Multi Jet Fusion. Turnaround is usually two to seven business days plus shipping, with rush options at a premium. The real skill is matching the printing technology to what the prototype must prove — form, fit, or function — because choosing wrong either wastes money on precision you do not need or produces a part too weak to test.

The four main technologies compared

FDM — cheapest and fastest for early iterations

Fused deposition modeling extrudes melted thermoplastic layer by layer. It is the least expensive process and perfect for early shape studies, fit checks, and bracketry. Visible layer lines and weaker strength between layers are the tradeoffs. Materials like PLA, PETG, ABS, and reinforced nylons cover most early needs.

SLA — fine detail and smooth surfaces

Stereolithography cures liquid resin with a laser, producing crisp features and near-injection-molded surface finish. It is the go-to for cosmetic models, ergonomic studies, and small precise parts. Standard resins are more brittle than production plastics, though engineering resins narrow the gap.

SLS — tough functional parts without support structures

Selective laser sintering fuses nylon powder, yielding strong, slightly grainy parts with excellent geometric freedom — no supports means complex internal features print cleanly. SLS nylon behaves close enough to production plastics that many teams use it for real functional testing.

MJF — SLS-class parts, often faster and cheaper in batches

Multi Jet Fusion also fuses nylon powder and delivers dense, consistent parts with good detail. For runs of ten to a few hundred units it is often the most economical route — a genuine bridge between prototyping and low-volume production before committing to molds, a decision we cover in 3D printing vs injection molding.

What 3D printed prototypes really cost

  • Small FDM parts: roughly $10–$50 each from a service; pennies in material if you own a printer.
  • SLA parts: roughly $25–$200 depending on size and resin.
  • SLS/MJF nylon parts: roughly $30–$300; batch pricing drops per-part cost sharply because parts nest together in one build.
  • Large or exotic parts (big enclosures, flexible materials, metal printing): several hundred to several thousand dollars.

Volume — the bounding box your part occupies — drives price more than anything else. Hollowing parts, splitting large housings, and orienting for nesting all cut cost meaningfully. Where 3D printing fits among other prototype expenses is covered in how much a prototype costs.

Turnaround: what to expect

Online services typically quote instantly from your uploaded CAD, print in one to three days, and deliver within a week. SLS and MJF run in scheduled batches, so simple parts sometimes wait for a build. Finishing steps — sanding, dyeing, painting, inserts — add days. If your schedule has a hard demo date, order one iteration earlier than you think you need; almost every project discovers a fix worth printing again.

Choosing: service bureau vs your own printer

A desktop FDM printer pays for itself within a handful of iterations and gives same-day loops for early geometry work. Services earn their fee when you need SLA/SLS/MJF quality, engineering materials, large build volumes, or many parts at once. Most productive teams use both: iterate cheap and fast in-house, then order service-grade parts for testing and presentation. The full technology landscape is mapped in our 3D printing pillar and our comparison of rapid prototyping techniques, including CNC and urethane casting for cases where printing is the wrong answer.

Design files matter more than the printer

Most disappointing prints trace back to the CAD, not the machine: walls too thin for the process, holes that need reaming, threads that should be inserts, tolerances that ignore process variation. Designing for the specific process — and for the injection-molded part it will eventually become — is standard practice in professional prototype development and mechanical engineering.

Get prototype-ready parts without the trial and error

Projects House designs prototypes for the right process from the start — and delivers printed, finished parts ready for real testing, then carries the same design into production. Skip the wasted iterations: contact us through the form and tell us what you need to prototype.