Why print-in-place joints fuse, and the Bambu Studio settings that keep them moving
Print-in-place hinges usually fuse at the first layer, where the plate squishes plastic sideways into the joint gap. Set Elephant foot compensation to 0.15 mm (Process → Quality), keep supports out of the joints, and keep the designer's layer height (or 0.12 mm for a finer, Quality print). Don't scale the model down too far: gaps smaller than about three quarters of the nozzle width tend to bridge shut.
Why it happens
The first layer is pressed into the plate so it sticks, which spreads it slightly wider than designed (elephant foot). In a print-in-place joint, that extra width closes the small clearance between the moving parts.
Supports inside a joint fill the very gap that lets it move. And scaling a model down shrinks its clearances too: a 0.4 mm gap at 100% is 0.3 mm at 75%, which a 0.4 mm nozzle can bridge.
The settings in Bambu Studio
- Elephant foot compensation
elefant_foot_compensationProcess → Quality0.15 mm on print-in-place and articulated models. - Supports
enable_supportProcess → SupportLeft off. If a part really droops, paint support only there, never inside a joint. - Layer height
layer_heightProcess → QualityThe designer's layer height on Balanced; at most 0.12 mm on Quality. - Small perimeters
small_perimeter_speedProcess → Speed25 mm/s, so the small pin loops cool instead of sagging into the gap.
Names are from Bambu Studio 2.x. The settings search box finds either the name or the key.
Good to know
- Rule of thumb: a gap narrower than about 75% of the nozzle width (0.3 mm on a 0.4 nozzle) tends to fuse. When you scale a model, Plateright works out the smallest size that keeps the joints open and tells you.
- If joints still stick, flex each one gently right after the print, while it is still slightly warm. A first-layer skin often breaks free cleanly.
What Plateright checks
The report finds moving joints by looking for shells that overlap with a small gap between them, counts them, and applies the joint settings only to those objects, so the rest of the plate keeps its own settings.
Questions
Should I turn on supports for a print-in-place model?
Almost never. Print-in-place models are designed to print without supports, and supports inside the joints fill the gap that lets them move. Plateright never turns supports on automatically.
Can I scale down a flexi dragon or articulated model?
A little. Clearances shrink with the model, and below roughly three quarters of the nozzle width they tend to fuse. Plateright checks the tightest gap at your scale and tells you the smallest safe size.
My joints are still stuck. What now?
Flex each joint gently while the print is still warm. If only the bottom sticks, the first layer is too squished: re-run the bed leveling and check the elephant foot compensation is on.
Related fixes
Updated September 28, 2026.