Just a couple of quick thoughts.
- Have you cleaned the bolt?
- TOO much tension on the thumbscrew may cause the filament to deform and make it harder to get through the system. Tight enough that you can't yank it out by hand should be enough.
- Have you checked the filament to see that it isn't too thick?
- When you tighten up the hot end too much tension on the four thumbscrews might put enough pressure on the end of the bowden to make it squeeze together at the connection to the brass so that the inner diameter gets too small. (I don't think this is likely though)
- This one happened to me once but I think it's very uncommon. Check that the nozzle isn't clogged.
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3dtopo 0
Sounds like you have a plugged hot end. Have you opened it up to take a look?
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