ABS IMHO is easy with the j-head, but 95% of my abs printing is with a 3mm/.35mm J-head. It also prints PLA beautifully, but seems to want to be run a bit hotter than my other heads.
The 1.75/.35mm has only done PLA, but it's done quite a bit. It likes to be cooled on it's fins, and again I tend to run it a bit hot - but I also print 100mm/s sorta speeds out of it as well. The new version of Repetier firmware says I've printed 336 meters of filament since I upgraded on Wednesday - been a busy week!
I'm not using a direct drive on either - I'm using a PG35L on the 1.75, and a bog standard Greg's Wade's on the 3mm. I've the best intention of swapping the Greg's for a phidgets planetary Nema17 as well, just not gotten around to wrapping up the design...
The 1.75 is easy to push filament through, the 3mm a bit harder - I strongly suspect you could use direct drive with it with no problems.
Neither likes to be "overheated" - if you print PLA and it get's too hot, it will start leaking. Also, since it's PTFE lined, you want to stay below 248c... If you got yours from Brian (hotends.com), there is an adjustment ring in the top you'll want to make sure is snug - he usually ships them adjusted pretty well. Nozzle has a nice shoulder - I've crashed mine a couple of times in building this last ordbot, and it's not been damaged.
mhensen wrote:If all is going well I will be getting my J-head V 1.75/.35 nozzle within the next week ..
So if anyone wants I can give a small review of it based on PLA and ABS?
Will try and put it in a direct drive system under repetier as I will be using 1.75.. (got rid off all the 3.0 stuff )