Constant diameter, no bubbles, cracks or defects. I bought several spools of this yarn. The thread itself is great! It produces flawless prints all over the roll! However, keep an eye on your machine and reel. This line was NOT tangled, but it was where the line was pinched on the side of the spool. This means that the line is caught somewhere between the correctly wound line and the side of the spool. This caused the spool to jump out of the spool holder and fall onto the printer below. Watching the video of the print showed that the filament was stuck which was causing this. I was present and was able to fix the problem simply by pulling firmly on the thread. However, when the spool collapsed, it pulled the filament out of the extruder while it was hot. This caused the teflon tubing to stick to the filament inside the printer, ruining about half a roll's worth of print. If I put the spool on the table next to the printer, the extruder might be able to clear the jam on the spool.
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