Print came loose part way through (spaghetti)
The print was knocked off or peeled away from the bed and the printer carried on, leaving a tangle of filament.
Also described as spaghetti, bird's nest, birds nest, print knocked over, print detached, came off the bed, tangled mess
Try these in order
Most likely and quickest to check first. Change one thing at a time so you know what fixed it.
Weak first layer grip
- Fix the first layer first: clean bed, correct Z offset, right bed temperature.
- Add a brim to tall or narrow parts with a small footprint.
Nozzle catching the print
Curled edges or overhangs bend up and the nozzle hits them on the next move.
- Turn on Z hop for travel moves.
- Improve cooling on overhangs, or add supports.
- Avoid crossing perimeters when travelling, if your slicer has the option.
Tall, thin parts wobbling
- Lay the part on its side if you can.
- Slow down the upper layers, or print two copies apart so each layer has time to cool.