I was taking a risk getting this for my 3Doodler pen, since the pen manufacturer says only use their brand of filament. This filament is flexible enough to straighten and insert into the pen. I cut it at the same length as the 3Doodler filaments, since I don't think the pen gears are strong enough to pull it off the spool. It went in fine and then backed out fine. It's a whole lot less expensive than the little packages of pre-cut filament.
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