Embedding magnets in 3D printed parts
Magnets work very well in 3D printed parts when the pocket, clearance, polarity and retention method are planned before printing. The most common problems are pockets that are too tight and magnets installed with the wrong polarity.
Do not use the nominal magnet size blindly
A magnet with a nominal diameter of 10.0 mm does not automatically need an exactly 10.0 mm printed pocket. Account for real printing tolerances.
Press fit or adhesive?
Press fit: clean assembly, no adhesive residue. Risks: pocket too tight, printed part cracks, magnet stops before seating fully. Adhesive: allows more clearance, easier positioning. The adhesive must be suitable for both the printed polymer and the magnet coating.
Mark polarity first
Before installation:
- identify the mating magnet
- mark the required pole
- use the same convention for all parts
- only then press or glue magnets in place
Insert during printing
Possible workflow: pause at layer → insert magnet → continue printing. Ensure:
- the magnet does not protrude above the current layer
- the nozzle cannot hit it
- it cannot move
- printer design allows the workflow safely
What to look for when buying
A sensible magnet choice follows clear technical specifications, not the highest advertised pull force.
- diameter clearly stated
- thickness clearly stated
- coating specified
- no misleading pull-force claims