Slicer interprets them as one object I think. So sequential is just the one object. Latest host version has changed a bit the format to be mor elike slic3r stores amf files, so maybe that helps.
+1 here, support for sequential printing would be a GREAT. If you use the "Obeject Group" you can have it both. Objectgroups are printed sequential. Objects in one Obbjectgroup are printed paralel.
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If you use the "Obeject Group" you can have it both. Objectgroups are printed sequential. Objects in one Obbjectgroup are printed paralel.