People have had bad luck with all metal head. PLA sticks to it too easily and it is even a more pain in the neck than replacing the white teflon part. Instead consider getting an i2k at my store (and some of those teflon parts):
http://gr5.org/store/index.php/um/i2k-insulator.html
I only have one left but have more coming in hopefully Monday. Here's the teflon part (cheaper in my store):
http://gr5.org/store/index.php/um/pair-duptef-couplers.html
I installed one of the Olsson blocks a couple days ago (from PrintedSolid) and it is already far more dependable than the stock block was. I looked at your store and saw .4 mm jet nozzles. Are those for the Olsson block? I did see several things I'd like to pick up at your store, when they're in stock.
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insight01 3
Many of the answers for the questions for using the E3D head on the UM2 can be found here:
https://ultimaker.com/en/community/view/11116-e3d-v6-on-the-ultimaker-2-system?page=1#reply-110320
Feel free to ask any questions. The weak point is still the extruder on the UM2 and all metal heads (E3D) can be a pain if you are not careful with calibrations and temperature control of materials. By the way the field has moved to 4 extruders and beyond for less then the price of a new UM2. Also, check out the cutting edge for project Ara between Google and 3DSystems. Multiple UM2 heads on an assembly line type system would be awesome.
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