Hi, Spacexula
Thanks for your feedback.
Would you please give me some detail about this overheating issue? I will study MK5 designs later.
Anyway, I did some improvments for this version based on MKIV and MKII. I had sold about 50 pcs this kind J head/K extruder with my pangu 3d printer in China. And about 500 pcs this kind J head were sold to the world wide. Did not meet any overheating issues.
Regards,
Chris