3DFILS - Flexible Filament for 3D Printing eFil TPU 60D: 1.75 mm, 500 g, Blue

Was surprised to have no issues printing with this filament. It's the first time I've printed with anything except PLA and was expecting poor results from the other reviews. I printed straight out the box, without any pre-heating or drying and it was no different to PLA. This may be due to me printing on a flashforge finder which has a setting for flexible filament. It was too flexible for the job I'd bought it for but that was no fault of the product. I went for the D90 which I believe is the most rigid of the flexibles but would love an even harder grade. Admittedly, it did appear to have been spooled by a monkey but this offered no issues. All in all, the product itself is OK and I can't find any major faults. Hopefully it will continue to perform well next time I use it and will be keeping it in an airtight, dry zip-bag.

Very unevenly spooled and coupled with the flexibility was unprintable on my Prusa

Poor quality filament, which is badly wound onto spool, and there are brittle sections in the filament which snap easily.