I spent the last two weeks trying to get a feeling for green-tec. (I tested the white one)
It's a real cool material from technical parameters' but also haptical point of view.
It's fully bio-degradeabe, doesn't produce any nasty fumes, withstands boiling water with ease and it's from a highly motivated Austrian start-up with outstanding customer support.
And with the 25% discount-code they post on the RepRap forum it's a real alternative to ABS.
But anyway ... I couldn't find a single setting which made this material stick on the heatbed of my Ultimaker 2+.
Whatever setting I tried - and believe me I tried a lot - it always curled up at the edges after 4-5 layers and and it really showed a nasty warping behaviour.
Using the STAPLES stick .. it behaved nearly like PLA --> But I don't like the look & feel of a surface produced with glue stick.
On the RepRap forum many users posted outstanding results with GTEC.
http://forums.reprap.org/read.php?335,489235
But ... most of them used FR4 or carbon plates.
Also Extrudr themselve recommend printing on a carbon plate.
So I shopped me a Carbon plate which fitted cosy on top of the glas-bed between the clips of my UM2+.
And what should I say ... All the problems werer imediatelly gone.
These are the settings for the 0.4-nozzle I'm using now in combination with the Carbon Plate (my focus is on mechanical strength and not on optitical esthetics)
h=0.1 -> 40mm/s -> 225°, 60°, Fan=0 for #1; Fan=100% for the rest
h=0.1 -> 150mm/s -> 240°, 60°, Fan=0 for #1; Fan=100% for the rest
h=0.25 -> 50mm/s -> 240°, 60°, Fan=0 for #1; Fan=100% for the rest
@neotko: really looking forward to hear from your experinces with gtec
But ... shouldn't we open a seperate thread for this cool material?