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Injection Molding Service

Custom injection molded parts for engineers for low volume runs, from 500 to 10,000 units

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Custom mold & plastic parts500 min. order quantityDesign verification program

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Our injection molding service

Order full production runs starting from 500 parts. Benefit from our global network of certified Injection Molding manufacturing facilities and get your parts into production.

Our capabilities

Our network of Manufacturing Partners gives you easy access to diverse capabilities to serve all your manufacturing needs.

Name Description
Molds with side-action cores Cores slide out of the part from the side before it is ejected from the mold. This allows for undercuts to be molded.
Overmolding Premade parts are placed into the mold to mold over them. This allows for multi-material injection molding.
Insert molding Inserts are placed into the mold and molding occurs around them. This allows for inserts such as helicoils to be molded in your design.
Family Molds/Multi-cavity molds Several parts are designed into the same mold tool. This allows for the minimization of tooling costs.

Available materials

All thermoplastics can be injection molded. Some thermosets and liquid silicones are also compatible with the injection molding process.

Additives and fibers

3D Hubs offers additives and reinforcements as options for your plastics parts.

Name Description
UV absorbers Absorb UV radiation, slowing down the degradation of the material when used outdoors.
Flame retardants Prevent ignition and inhibits spread of fire.
Plasticizers Increase flexibility and promotes plasticity, reducing brittleness of the material.
Colorants Used to color plastics.
Carbon fibers Increase strength, toughness, and rigidity of the material at the expense of making the material more brittle.
Glass fibers Increase strength, toughness, and rigidity of the material at the expense of making the material more brittle. It is more flexible than carbon fibers.

Surface Finishes

Injection molded parts are not usually post-processed, but the mold itself can be finished to affect the surface finish of the molded part.

This way aesthetic needs or technical requirements can be achieved.

  Name SPI Standard Description
 gloddy finis IM Glossy A-1, A-2, A-3 The mold is smoothed and then polished with a diamond buff, resulting in parts with a mirror-like finish.
im-part-1 Semi-gloss B-1, B-2, B-3 The mold is smoothed with fine grit sandpaper, resulting in parts with a fine surface finish.
IM101-PS part Matte C-1, C-2, C-3 The mold is smoothed using fine stone powder, removing all machining marks.
IM101-PC part 2 Textured finish D-1, D-2, D-3 The mold is first smoothed with fine stone powder and then sandblasted, resulting in a textured surface.
matte finish As-machined finish   The mold is finished to the machinist's discretion. Tool marks may be visible.

For a detailed description of the SPI standards and their compatibility with each material take a look here.

Injection molding design guidelines

The table below summarizes the recommended and technically feasible values for the most common features encountered in injection molding.

Learn more in our Engineering Guide to Injection molding.

  Feature Recommended Description
IM101-rules-wall thickness Wall thickness Thickness: 1 mm and 3 mm To avoid warping and sinking, parts should be designed with the smallest possible and constant wall thickness.
IM101-rules-smooth transitions Smooth transitions 3 × wall thickness difference If wall thickness cannot be avoided, use a chamfer or fillet to make the transition as smooth as possible.
IM101-rules-rounded edges Rounded edges Internal edges: > 0.5 × wall thickness
External edges: internal fillet + wall thickness
Add a fillet with a radius that is as large as possible to all internal and external edges.
IM101-rules draft angle Draft angle For parts taller than 50 mm: increase the draft by 1° for every 25 mm
For parts with a textured finish: increase the draft by an extra 1°-2°
Add a draft to all vertical walls to make the ejection of the part easier and avoid drag marks.

Design verification program for injection molding

3D Hubs offers the Design Verification Program (DVP) for all injection molding orders.

Similar to First Article Inspection, our Design Verification Program allows you to receive two sets of parts for inspection and test fit before continuing with the full production run.

Learn more

3dhubs design verification program

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  • NET 30 payment terms
  • Non-disclosure agreements
  • Design verification program Learn more
  • Dedicated account manager

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