Hi,
only as a suggestion:
I believe that the use of filaments (... such as ABS, CO-Polyester, or other special filaments) that require long-term very high temperatures above 230 degrees will destroy your UM2-PTFE-ColdEnd very quickly. The cooling of the ColdEnd on Ultimaker 2 is definitely not efficient enough, and you should (...as you've already mentioned it) as a precaution, obtain a small supply PTFE-Coupler. The intense heat transfer from HoEnd to ColdEnd, makes the PTFE very soft near the transition area and this area is slowly being eroded.
In the exclusive (daily) PLA-use, with moderate temperatures 210-230 degrees, holds a UM2-PTFE-Coupler by a maximum of 3 months, after which the part is already worn out.
The cleaning methods, such as pulling out of the filament from the heating chamber, usually at temperatures of 90 degrees for PLA, promote premature wear as deformed filament damage the inner wall of the Coupler.
I think it is better if a more efficient cooling for the ColdEnd, or a more resistant ColdEnd material was discovered, then it really makes sense with more specialized materials and high temperatures to Experiment.
Markus
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ultiarjan 1,223
maybe someone from colorfabb ( @Gijs ) can clearify the advised printing temperature, I see that on the site now the advised temperature for the regular XT is also 240-260.
On the box I have from april it says 250-260, the box I have form june is labeled 240-260 so I assume this advice on printability at 240 is a deliberate change.
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