Inconsistent extruding from nozzle

[printbus]

Reaping miner, I'm still not sure what you have for a hot end. The Orballo website only shows one printer - is that the one you have? The description doesn't say anything about using an E3D-brand hot end (did I miss it?), and it describes the hot end as generically being a "V5". You say you can't fit a PTFE liner in your heatsink, but all E3D v6 hot ends for 1.75mm filament have a PTFE liner that passes through the heatsink and into the top end of the heat break. Assuming you might have an E3D v5, I believe even those had a PTFE liner that went partway into the heatsink. So, without more pictures it's impossible to understand what you have.

EDIT: Bowden extruders use the PTFE tube in a different way. The extruder motor is located a ways from the extruder, typically mounted on the fixed frame of the printer. Having a short section of PTFE tubing in the hot end anywhere does NOT mean you have a Bowden extruder. This does confuse people, especially since the same material used for a Bowden tube is typically used for the PTFE liner.

Regardless... If the heat break tube is now stuck in the heatsink, you possibly had melted filament get way up in the heatsink where it shouldn't have been and melted filament got into the threads between the heat break and the heat sink. This could happen if you let the printer sit at too high of a temperature for too long, and/or have inadequate cooling airflow for the hot end heatsink. If so, you likely now have a partially clogged heat break tube (and possibly heatsink) that occasionally binds with the filament, leading to what you are seeing.