3D printing & polymer molding

From first print
to molded part.

Industrial SLA and SLS printing, urethane vacuum casting, silicone/LSR molding and bridge injection molding — coordinated by one engineering team. We match the route to your quantity and tolerance, and tell you candidly when a printed or cast simulant will not behave like molded plastic.

  • ISO-aligned outgoing QC
  • NDA on every project
  • Free DFM review in 24 hours
Vacuum casting
±0.15 mm10 – 100 parts
Injection molding
±0.05 mm100 – 10,000+ parts

Process selection

Four ways to make a polymer part. Most runs have more than one answer.

What the part is made of, how many you need and whether it must be the production material each move the answer. Pick all three and we rank the four routes — with the tooling, tolerance and lead time that come with each.

What is the part made of?

How many parts?

Start with SLA or SLS printing. It is the only route that fits both answers; vacuum casting and rapid injection molding work with a trade-off.

A handful of parts in a production plastic? CNC machining cuts POM, nylon and PEEK from solid stock, so you can test real material before any tool is cut. Quote CNC machining

Ranked on material, run size and production material, then tooling cost for short runs or unit cost for long ones. Tolerances on marked dimensions are confirmed in your DFM review.

Send your CAD for a DFM review
PROC-01  3D printing Recommended for 1 – 10 parts
Section through an SLA resin vat: a UV laser cures each layer at the resin surface while the build platform steps down one layer at a time, so the part grows down into the vat on its supports SECTION A-A SLA RESIN VAT Z UV laser Resin surface Cured layers Supports Build platform Resin vat SLA printing on the Purniss polymer line
PRINT  SLA tough resin  0.05 mm layers

SLA & SLS 3D printing

No tooling at all: parts are built layer by layer straight from your CAD. SLA gives the smoothest surface for cosmetic models and casting masters; SLS nylon gives tough, support-free functional parts.

Ideal for
Prototypes, fit checks
Quantity
1 – 50
Tolerance
±0.1 mm SLA
Lead time
1 – 3 days
Min. wall
0.5 mm SLA
Layer
0.05 – 0.1 mm
  • Standard & clear resin
  • Tough & high-temp resin
  • PA12 nylon
  • PA12-GF (glass-filled)
  • Flexible TPU

Key applicationEnclosure and bracket prototypes for fit checks before any tool is cut.

Quote 3D printing

Side by side

Typical values. Marked rows feed the ranking above; pick a column to open it on the board.

3D printing, vacuum casting, rubber molding and injection molding compared
Property
For your part Start here Trade-off Not a fit Trade-off
Best quantity 1 – 50 10 – 100 100 – high volume 100 – 10,000+
Tooling cost None Low Medium High
Unit cost at volume High Medium Low Low
First parts in 1 – 3 days 7 – 10 days 2 – 3 weeks From 7 days, aluminum tool
Tolerance ±0.1 mm SLA
±0.2 mm SLS
±0.15 mm ISO 3302 M3 ±0.05 mm
Min. wall 0.5 mm SLA
0.8 mm SLS
1.0 mm 1.0 mm 0.8 mm
Production material Simulates it Simulates it Yes Yes
Typical materials SLA resins, PA12, PA12-GF, TPU ABS-, PC-, PP-like and rubber-like PU Silicone, LSR, EPDM, NBR, FKM ABS, PC, PP, PA66, POM, PEEK, TPE

Tolerances are typical for features up to 100 mm; tighter values on marked dimensions are confirmed in your DFM review. Lead times and wall thickness are typical and confirmed in your quote. Why “simulates it” matters: see the engineering note.

Material range

The polymers we print, cast and mold, on one table.

Hover or tap a material for grades, process and typical use. Filter by process to see what each line runs. Gray cells are made on our metal lines.

Show materials for
SLA Rs Resin
  • SLA

Standard & clear resin

The smoothest surface and finest detail we print. Grey and white grades show surface flaws clearly in design reviews; clear resin polishes to near glass.

Grades
Standard, grey, white, clear
Key property
0.05 mm layers
Common application
Visual models, fit checks
6CCarbonCNC / EDM 12MgMagnesiumDie 24CrStainlessInvestment 26FeIron, steelSand / Inv. 29CuCopperSand 30ZnZincDie 74WTungstenWire EDM
  • Photopolymer resins
  • Thermoplastics
  • Cast polyurethane
  • Elastomers
  • Tooling & partner metals
  • Other lines

Polymer & molding network

The equipment behind your polymer parts.

Large-format SLA and SLS printers, vacuum casting chambers, elastomer presses and rapid injection molding cells across our lab and audited partner network — so your part scales from first print to production tooling under one engineering team.

Capability view, not a single shop. Each order is routed to an audited partner cell that meets these specs. The fleet page lists the full printer, press and molding machine roster.

Explore our partner shop network
EQ-01 Industrial SLA printers In service
Schematic of a large-format laser SLA printer: a scanning laser cures each layer at the resin surface while the build platform lowers on Z Z Laser scanner Part0.05–0.1 mm layers Recoater Resin vatStandard to high-temp Build platform 400 Industrial SLA printers Build 600 × 600 × 400 mm

Large-format laser SLA

For cosmetic prototypes, clear parts and the master patterns behind every vacuum-cast batch. Long parts print in one piece instead of glued sections.

Build volume
600 × 600 × 400 mm
Layer
0.05 – 0.1 mm
Resins
Standard, tough, clear, high-temp
Best for
Cosmetic models, casting masters
Accuracy
±0.1 mm
Layer
0.05 mm
Lead time
1–3 days

Design guide

Tolerances and limits, drawn to scale.

What each process holds as standard and the smallest features it builds reliably. Mark critical dimensions on your drawing and we confirm them in the free DFM review.

TOL  Standard tolerances, features up to 100 mm Drawn to scale
  • Injection molding Aluminum or steel tool ±0.05 mm
  • SLA Resin ±0.1 mm
  • Vacuum casting Polyurethane ±0.15 mm
  • SLS Nylon PA12 ±0.2 mm
  • Rubber & LSR Elastomers Class-based, varies with part size ISO 3302 M3

Bands are drawn to scale; the full track is ±0.25 mm. Tighter values on marked dimensions are confirmed in the DFM review.

MIN  Minimum features Typical
Min. wall, SLA
0.5 mm
Min. wall, SLS
0.8 mm
Min. hole diameter
Ø1.0 mm
Embossed detail depth
0.2 mm
Moving-part clearance, SLS
0.5 mm

Finer features are possible on SLA. Anything at risk is flagged in the DFM review before you pay.

Outgoing QC on critical callouts & fit features Every dimension marked on your 2D drawing is verified via CMM, optical profiler or pin gauges before dispatch, with the report included.
  • CMM report
  • Optical profiler
  • Material CoC

Materials for harsh conditions

Pick one to open it in the material table.

Heat

Polymers that keep their shape and dimensions under continuous high temperature.

Chemicals & fluids

Elastomers and plastics that resist swelling and attack from oils, fuels, water and solvents.

Impact & load

Tough grades that take drops, snap-fit cycles and sustained loads without cracking.

Engineering note

The “ABS-like” illusion.

Printed and cast polymers are excellent for form and fit. They simulate production plastics — they do not share their molecular structure. Before you load, heat or cycle a prototype, know where the gaps are.

ADV-01  Printed vs molded, same geometry Read before testing
PrintedLayer bonds form a weak plane in Z
MoldedSame strength in every direction
  • Layer strength (Z-axis)

    Printed parts are built in layers, and the bond between layers is the weak plane — up to 20% lower strength along Z. Molded parts have no layer planes.

  • Heat, UV and fatigue

    Standard SLA resins are thermosets: they can turn brittle over time and degrade in UV light, and they lack the cyclic fatigue life of molded PA66 or POM.

  • Ratings belong to the resin

    UL 94 flame ratings and food or medical approvals are tied to a specific molded grade. A simulant cannot carry them, so certification tests need the real material.

Need production material for the test?

If your test needs real engineering resin — glass-filled nylon, PC/ABS, PEEK — skip the simulant and use a rapid aluminum tool. Molded parts in as little as 7 days.

After the print

Finished, assembled and checked under one order.

A raw print or casting is rarely what goes into the product. One routing sheet covers support removal, finish, inserts and inspection, so the part arrives ready to use.

ROUTING  PN 7120-C  Handheld housing, ABS-like PU · rev B 5 operations
  1. OP 10

    Print, cast or mold

    Made by the process agreed in your DFM review. Printed masters are measured before a silicone mold is taken from them.

    RecordBuild or batch number
  2. OP 20

    Supports off & post-cure

    Supports removed by hand, SLA parts UV post-cured to full strength, SLS parts depowdered and bead-blasted.

    RecordCure cycle logged
  3. OP 30

    Finishing & color

    Sanding, primer and paint to a Pantone or RAL code, soft-touch coatings, mold textures, polished clear parts and pad printing.

    RecordColor chip approved Finishing options
  4. OP 40

    Inserts & assembly

    Heat-set threaded inserts, bonding and sub-assembly with your machined or cast parts, so you receive a working unit.

    RecordFit & torque check Multi-process assembly
  5. OP 50

    Inspection & shipping

    Critical dimensions on CMM or optical profiler, cosmetic faces protected part by part, shipped on DDP or DAP terms.

    RecordReport before release Quality process
One project engineer signs off every operationReplies within one working day

Printing & molding questions

What engineers ask before they send a model.

Straight answers on process, material, tolerance and lead time. Anything else goes to an engineer, not a sales queue.

Which process should I start with?

Start from material and quantity. For 1 – 10 rigid parts, print them in SLA or SLS. For 10 – 100, vacuum casting gives a molded look without a steel tool. From a few hundred parts, rapid injection molding in an aluminum tool usually costs less per part. Rubber parts move from cast urethane to compression molding or LSR. Your free DFM review names the process and explains why.

Will a printed or cast part behave like the molded one?

For form and fit, yes. For load, heat, fatigue or certification, not exactly: printed parts are weaker across their layers, and ABS-like or PC-like urethanes simulate the plastic rather than being it. If your test needs the production resin, we recommend a rapid aluminum tool.

What tolerances can I expect?

Typical values for features up to 100 mm are ±0.1 mm for SLA, ±0.2 mm for SLS, ±0.15 mm for vacuum casting and ±0.05 mm for injection molding. Rubber parts follow ISO 3302 class M3. Mark critical dimensions on your drawing and we confirm them in the DFM review.

How many parts does one silicone mold make?

Usually 15 – 25, depending on the material and how complex the part is. For larger batches we take several molds from the same printed master, so 100 parts is a normal vacuum casting order.

Can you match colors and finishes?

Yes. Parts are sanded, primed and painted to a Pantone or RAL code, with soft-touch coatings, textures, polished clear parts and pad printing available. We send a color chip for approval before the batch is finished.

Is there a minimum order quantity?

There is no strict MOQ. A single print is fine, and cast or molded batches are quoted at the quantity you actually need.

How are parts shipped?

By express, air or sea freight on DDP or DAP terms, with cosmetic faces protected part by part. Your project engineer sends tracking the same day the parts leave.

Strict IP & NDA protection

Your designs stay yours.

Whether it is an unreleased product enclosure or a custom silicone seal, your CAD files are stored in an access-restricted vault—never broadcast to an open bidding board.

  • Mutual NDA available before you upload
  • Never posted to public supplier boards
  • Access restricted to your project team
Talk to our team