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OMG---
What the hell i was doing for the past couple of week I ordered two roles of PLA filament from two different vendors from China and one role they send me ABS instead of PLA.... I was printing with that at PLA temperature and what i got poor printing quality with cracks in the layer... I just watched the video today that gave me a Lit-miss test of PLA and ABS... You must watch...
http://www.youtube.com/watch?v=zqanb6mH-xU

I tested both of the filament and found that the Green filament is actually the ABS ...what a shame....Bumped the bed temperature to 80C - My ordinary glass shattered but still i am getting good prints. Furthermore i used 230C to hotend....

Please always check your filament before start printing.

De-laminated layers and poor adhesion between layers result in poor quality and weaker part.... now no more....Long Live China

See the difference... I love Cura

Been seeing alot of mis labled filament. It even got one of the leaders of the forum about a year ago. I like the simple burn test method, pla burns nice and clean with a blue flame, abs is a black smokey flame.

I'm a proponent of buying known decent filament and spending $5-10 more if I have to and not waste a ton of time. You're money ahead to buy quality filament - and I'm talking about something as simple as hatchbox or gizmodorks on amazon.

LOL, I had a similar thing happen to me last year with an evil pink "PLA". It was from a US supplier but no matter. I tried everything I could to get it to stick. I even sent samples to other board members to test and see if they could get it to stick the first layer. I did everything I could think of, except, of course, the simple thing - test it to make sure it was PLA! Turned out to be ABS.

Im not sure why, but this mislabled filament thing makes me think of a time when I was building a pile driver barge designed by an engineer. He designed it using a 1/4" cable that would tilt the gantry from 30 to 90 deg. I took one look at the cable, the gantry, and the pnumatic ram and said that cable will break and kill someone, it needs to be 5/8". After a bit of an arguement with the engineer who pulled out all the documentation showing the various weights and loads the cable could withstand and being brow beat down that I dont know what I was talking about the barge was constructed with the 1/4" cable and put into service.
On the first piling driven with the new barge, the cable snapped, the gantry fell fwd and then snapped the cable and air lines the lowered the pnumatic ram dropping it right to the bottom. No one was injured but the ram was lost to the silty bottom forever and the ganrty was twisted beyond repair along with the deck plates. Turns out the documentation on the cable was incorrect by one decimal point (or so I was told)

Moral of the story? Dont let the mind blind the eye.

I had this problem once. I figured it out when I ran it through the hot end, and I could smell it. Well, PLA doesn't smell, so I figured out it had to be ABS. Sure enough, it was more pliant than any reel of PLA I had.

DavidF, that's an interesting story. I've been in executive hangars with enormous bifold doors winched with steel cables, doors that must have weighed 30,000+ pounds. Any time the door was in motion, I thought about all the energy stored in those cables, and what would happen if one of them were to shear off. I planned where I walked around not being in range! You can never "overengineer" something like that, I think. Something similar happened to my plumber when he was using a hydraulic ram to drag some sewer pipe through the ground. The steel cable snapped because it wasn't strong enough!