In addition to what Calum asked, what print settings are you using to slice? How fast, and what layer height, nozzle width, wall thickness settings?
Also, when testing extrusion, I highly recommend only turning the big gear wheel by hand. Don't use the ulticontroller, because I find that can very easily end up forcing too much plastic through the head too quickly. That can immediately cause more clogs by increasing the pressure in the head and causing molten plastic to squirt back up into the colder parts of the head. If you turn it by hand, you'll start to feel the back pressure as you turn, and can slow down a bit.
Also, when you have extrusion problems, be sure and remove the plastic from the bowden and check that it's not damaged. Cut off any damaged parts that might have been chewed up by the extruder drive. They will just cause more problems.
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snowygrouch 1
1) what kind of plastic are you trying to print
2) Which program are you using to slice
3) how big is the part (ie now long are the prints)
4) What temperature are you trying to print at
5) Do you have the fan on, if so after how many layers
6) Did you make sure that there are no gaps in the hotend when you assembled it
7) Have you checked you assembled the hotend correctly ? You can get the orientation wrong I believe
with the new hotend
8) what print speeds are you using
9) Pictures help alot,...take pics of your hotend so we can see how you have assembled it
We are not really interested in what you did to fix the blocks, but more what you were doing when they happened.
Also, there are ALOT of old threads on this stuff...have you checked them yet?
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