I actually just ordered a E3D hot end because the j-head supplied with my MakerFarm i3 keeps jamming due to the PTFE tubing/lining warping/burning/deforming where nozzle connects to the PEEK body. It's quite annoying and I don't know if it's a design flaw or bad PTFE or whatever but having to change it out once a month due to heavy printing gets old very fast lol. So I went with the E3D with a 0.25mm nozzle and I'm quite excited for it to arrive sometime next week!