Sequential (Print One at a Time) 3D Printing: Setup, Gantry Clearance, and When to Use It

Most of this site's multi-part printing coverage focuses on printing many identical parts side by side, layer by layer across the whole plate at once — and on multi-color workflows built around purge towers and tool changes. There's a third mode that solves a different problem entirely: sequential printing (called "Print Sequence: By Object" in Bambu Studio, "Complete individual objects" in PrusaSlicer, and similar names in OrcaSlicer and Cura) finishes one object completely, top to bottom, before moving the toolhead to the next one and starting it from its own first layer. It trades total print time for something layer-by-layer printing structurally cannot offer on many machines: parts that can be genuinely taller than the printer's Z clearance would otherwise allow the toolhead to clear, and print jobs that keep producing finished parts throughout an overnight run instead of only at the very end.

Why This Exists: The Gantry Clearance Problem

On a standard layer-by-layer print, every object on the plate grows in height together, and the entire gantry — not just the nozzle, but the print head assembly, fan shroud, and on some machines the X-axis rail itself — must physically clear every other object on the bed at every single layer as it travels between them. If one object is a 200mm tall vase and you want to print a 20mm keychain next to it, the printer must still lift the whole gantry to 200mm height for every layer just to move past the tall object safely, and depending on the machine's frame geometry, sometimes an object simply can't share a plate with a much taller one at all without the gantry or an X-axis rail physically colliding with it. Sequential printing sidesteps this: since only one object is being worked on at a time and every other object on the plate is either not yet started or already fully complete and out of the way, the toolhead only needs to clear finished objects by their static height while traveling — a fundamentally easier clearance problem, and on many printer frame designs it's the only way to safely combine a tall part and a short part in the same job at all.

Setting It Up

1. Enable the sequential/by-object mode in your slicer's print settings — in Bambu Studio and OrcaSlicer this is under Print Settings → Others → "Print sequence," set to "By object" instead of the default "By layer."
2. Check your slicer's clearance/exclusion zone visualization. Most slicers that support this mode will draw a visual "danger zone" around each object showing where the gantry's physical envelope would collide with a neighboring object — objects placed too close will be flagged before you ever start the print, not discovered mid-job.
3. Arrange print order deliberately where the slicer allows manual ordering — printing shortest-to-tallest, or in an order that keeps the toolhead's travel path clear of not-yet-printed areas, reduces both travel time and collision risk versus leaving arrangement entirely automatic.
4. Reduce or disable per-object cooling delays that assume a shared cooldown period — since sequential mode finishes one part fully (including its own natural interlayer cooling time) before starting the next, some cooling-related settings tuned for layer-by-layer printing's built-in cross-object cooldown gap behave differently and may need retuning per-object.

Real Advantages Beyond Height

• Parts finish progressively, not all at once. On a farm or overnight run, sequential mode means the first few parts on the plate are done and removable hours before the whole job finishes — genuinely useful for a print queue where you want the earliest possible parts pulled off rather than waiting for the entire plate.
• A failure on one object doesn't require restarting the whole plate. If object three of six fails or is knocked loose, objects one and two are already fully printed and off to the side; depending on your slicer and firmware you can potentially resume or skip forward rather than losing every object on the bed the way a shared-layer failure often does.
• Cleaner isolation for parts with very different settings needs. Because each object prints in complete isolation, per-object profile overrides (different retraction, different fan curve) behave more predictably than in shared-layer printing, where the printer is juggling multiple objects' settings within the same physical layer pass.

Real Costs and Limitations

• Total time is usually longer. Every finished object requires the toolhead to fully retract, travel clear, and in many configurations re-home or re-prime before starting the next object — overhead that shared-layer printing amortizes across the whole plate instead of paying per object.
• Not available (or not safe) on every printer. IDEX machines, tool-changers, and printers with unusually large fixed gantry structures each have their own constraints on whether — and how — sequential mode can be used safely; check your specific printer's documentation rather than assuming it's universally supported the way layer-by-layer is.
• Bed adhesion failures are more consequential mid-job. A part that comes loose from the bed while a neighboring object is being printed nearby is now a piece of debris sitting directly in the travel path of a toolhead moving at speed — sequential mode makes solid first-layer adhesion even more important than usual, since there's no shared-layer "everyone comes up together" behavior to make a lifting corner obvious early.
• Not the same as Klipper's Exclude Object. Exclude Object (already covered on this site) lets you cancel one failed part mid-print without losing the rest of a shared-layer plate — it doesn't change how objects are sequenced, it just lets you drop one from an ongoing layer-by-layer job. Sequential printing changes the fundamental print order itself.

When to Reach for It

Use sequential printing when you specifically need to combine objects of very different heights on one plate, when you're running a farm and want parts available progressively rather than all at the finish line, or when per-object clearance is otherwise blocking a batch job entirely. Stick with standard layer-by-layer printing for same-height batches of identical parts, where its better cross-object thermal averaging and lower total print time remain the better default.