I only recently added the FT-5 cooling duct (the one found on Google drive) and a 40mm 10k server fan. My 0.4mm hotend was not insulated, so within a few seconds I got the thermal runaway error.
So I bought new throats, hot ends and nozzles, which I insulated to help cope with the thermal runaway.
I decided I wanted to try printing with a super-fine nozzle. In my head, it made sense that a smaller nozzle could/would/should produce a higher quality print.
Of course, at the cost of doubling the time it takes to print something, which I was fine with doing.
I am continuing to use the typical 1.75 filament, and the stock MK9 extruder. I secured my new nozzle, but when I tried to test extrude I could hear a sort of 'tick' noise coming from the extruder. If I applied pressure to the filament, it streamed out of the nozzle like normal; albeit a smaller diameter.
I decided to run a small print. However, the extruder motor continued to 'tick' and only small bits of plastic extruded, nowhere near a straight line!
I increased the temperature of the hotend to 225, thinking the plastic needed to be melted better to squeeze out the nozzle. This barely made a difference. Sure, more plastic, but it still was only in small dots spread apart.
I tried increasing the filament feed rate to various settings in Repetier host (up to 150%) but the results were still just spots of plastic.
A co-worker suggested that I may need to tighten up the tension on my extruder. Something about an adjustable screw. He explained that it would force the filament into the chamber better, instead of just slipping.
I looked over my extruder but I could not locate the tension adjuster at all. The only thing I see is a simple spring.
Here is a picture that may help explain:
So my question: Has anyone been successful in extruding out of a 0.2mm nozzle using the stock MK9?
I did see an article by Walter called Print speed, filament, extruder, nozzle : how fast? which was helpful, but never dipped below the 0.4mm nozzle.