An assembly where multiple moving or mating parts are printed in a single build without supports between them, ready to use directly off the printer.
Print-in-place relies on clearance between parts and orientation so no support material bridges across moving interfaces. SLS is ideal: powder acts as self-support and provides the exact clearance gap. FDM works for horizontal clearances ≥0.3 mm; avoid vertical (Z) clearances due to layer adhesion bridging.
SLS: clearance 0.5 mm, open channels for powder escape. FDM: orient chain links or hinges in XY, clearance ≥0.3 mm, use raft for bed adhesion. Model a sacrificial plug between moving surfaces in CAD: remove after print to guarantee gap.
FDM print-in-place along Z often fuses due to thermal convection. SLA: if resin fills a thin gap and cures, parts bond permanently. SLS: if clearance < 0.4 mm powder cannot escape: flush with compressed air. Never use PLA or standard resin for print-in-place bearings.
Related terms: Clearance for moving / mating parts, Snap-fit design, Living hinge
| Theme | assembly |
|---|---|
| Also called | print-in-place joint, printed-in-place hinge |
| Source | sources/2026-04/2026-04-24--3d-printing-best-practices-guide |
Engineer, author of The Big Book of 3D Printing and additive manufacturing expert