I think we might need a little more detail.
1. What type and size of filament are you using? (PLA or ABS; 3mm, 1.75mm)
2. Which version of gregs are you using? (Derived and Remix sections from
here might help you identify.)
3. What type and size of
hot end are you using?
4. What do you mean by "junks up"?
5. If you are using PLA do you have a fan blowing on the top of your hot end where it meets the extruder?
