"Spaghetti" is what an unattended FDM printer produces when a part detaches from the bed mid-print. The nozzle keeps extruding into empty air, building a tangle of strings around the toolhead. The good news: every modern printer has at least one way to detect and stop this automatically — if you turn it on.
Enable AI spaghetti detection on your printer (Bambu, Creality K-series, Prusa Connect) or add SimplyPrint (cloud platform) to OctoPrint/Klipper/Prusa for AI failure detection plus remote monitoring. Verify the part is firmly stuck to the bed before walking away — bed adhesion failure causes 80% of spaghetti. Print first layers with you in the room.
The most effective option: a camera watches the build plate, an ML model recognises the chaos pattern of strings, and the print pauses.
Detects when the filament finishes or breaks. Will pause the print and prompt for reload. Doesn't detect spaghetti directly, but prevents one common cause of mid-print abandonment.
Prusa MK4 / CORE One and Bambu use loadcells that detect when extrusion pressure goes wrong. They auto-pause if the nozzle is extruding into thin air for too long.
Sometimes plastic keeps extruding around the hotend until a solid blob the size of a golf ball forms. Removing it:
See Prusa's extruder blob guide for printer-specific photos.