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.
- PETGTough everyday material with grade-dependent compliance options.
- ASAThe outdoor specialist - ABS mechanics with true UV stability.
- PA12Tough, low-friction nylon for functional mechanical parts.
- PCPolycarbonate - high impact, high heat, transparent option.
- PA12-CFCarbon-filled nylon 12 - the metal replacement workhorse.
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.
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
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.
Read next
Infill and strength: why 100 percent is rarely the right answer
The first idea for a fragile part is more infill. Measurements and practice show something else: walls carry, fill supports. What that means for your parts.
Wall Thickness Guidelines for FDM Parts
Getting wall thickness wrong leads to weak walls and failed parts. Here is how to choose the right shell thickness for strength, speed, and reliability in FDM printing.
Printed Jigs and Fixtures: Where They Pay Off in Production
Tooling is almost always a one-off. That is exactly where printing beats machining.