Hi guys. A quick update. I have recently replaced my Jhead hotend with an E3D mk5. I took the opportunity to also drop from 0.5 to 0.4 for the nozzle and I have a 0.3 nozzle spare to try. The new hotend is simply superb. The Jhead was ok but I got tired of the yards of ooze that dripped from it during warmup. It made unattended print virtually impossible for me as I had to be there to keep wiping the nozzle. So far I've pushed both PLA and ABS through the E3D and the results from both are good. One downside is that I've lost about 20mm of build height but as I still have 320mm it's not really an issue. I could always redesign the groove mount to fit above the effector anyway.
Andy
Andy