Thanks Barry and Ryan, much appreciated.
I’ll do a little more calibration with slower print speeds and lower extruder temp (was 210 degrees C). More cooling is trickier without getting a bigger fan and printing one of the cooler duct mods that are around. I’ll try the Slic3r cooling settings to see if I can get the fan to kick in earlier first.
I love this MPCNC idea and had been hanging out waiting for the 25.4mm version so thanks for that Ryan. A lot of guys at my work are really keen to see this in action – as am I.