Threads that survive repeated assembly

Threads cut directly into plastic wear quickly. Heat-set brass inserts take far more assembly cycles. We install them after printing and you receive ready-to-assemble parts.

Please state thread size in the request

When inserts make sense

Whenever screws are undone more than a few times.

Service covers

Covers that are opened regularly.

Fixtures

Clamps and stops that get adjusted.

Housings

Electronics housings with screwed-in boards.

Brackets

Mounts on machine frames and profiles.

Suitable materials

Inserts hold in almost all engineering filaments. For high temperature or vibration we recommend PC or carbon-filled materials.

Read the materials guide

What we need for inserts

  • 01Thread size and desired insert length.
  • 02Pilot hole in CAD, or a note that we should add it.
  • 03Enough wall thickness around the hole.
  • 04Tightening torque, if known.
Full DFM checklist

Don't forget wall thickness around the insert

During installation the plastic around the insert is displaced. If the wall is too thin, it bulges or cracks later under torque. As a rule of thumb the boss outer diameter should be about twice the insert's outer diameter, with at least roughly 1.5 mm of remaining wall. We size the hole to the insert manufacturer's specification.

We also print the area around the hole more solid than the rest of the part. It costs little material and makes the joint much more robust.

Manufacturing data at a glance

Location
Schleswig, Germany
Part size
up to approx. 250 x 250 x 250 mm, larger parts split and joined
Quantities
1 to several thousand, no minimum order quantity
Tolerances
approx. ±0.2 mm for PLA, PETG and carbon grades, ±0.3 mm for ABS, ASA and PC
Layer height
0.10 to 0.30 mm
Materials
20 engineering filaments from PLA to PA12-CF and PC FR
File formats
STEP, STL, 3MF, OBJ, IGES up to 200 MB
Lead time
2 to 4 working days for samples, 4 to 15 working days for series
Instant Quote

Upload Your File for Instant Pricing

Receive fast pricing and manufacturing feedback in minutes. STEP, STL, 3MF and OBJ supported.

Threaded insert FAQ

Which thread sizes are possible?

M3 to M5 are the most common. Inserts are available from M2 to M8, other sizes on request.

Do I have to model the hole myself?

No. Mark the positions and we adapt the diameter to the insert.

Isn't a printed thread enough?

For a few assemblies and low forces sometimes. Once screws are used regularly, an insert is the safer choice.

How do I get a price?

Upload your STEP or STL file in the instant quote. You see the price immediately, and we check the file for problems before production.

Which information is needed for Threaded inserts?

Send a STEP file where possible, together with quantity, operating temperature, load, environmental conditions and critical dimensions. This lets us define material, orientation, production strategy and inspection effort for the part.