So I'm trying to home-brew an all-metal hotend. My first attempt is not doing great so I'm looking for input from people who have some experience with them.
Basically, I've taken a SS M6 screw, drilled it through at 2mm, turned off the head, then cut a reduced OD (4mm) between the heatsink block and the heater block. I put thermal compound on the heat sink as well.
Results so far are great flow with ABS at 250C until the first retraction, then clog. I can force it to extrude by hand but the next time it retracts, I get a clog again.
Should I reduce the OD of my heatbreak to 3mm for greater isolation, or am I missing something basic?