5 years means you need no egg sucking lessons from me then :-)

That said its hard to see in pics, but does your printer use the bowden type extruder with the stepper separate from the hot end, or is the extruder stepper integrated onto the hot end? If the latter then its probably similar to my printer and one area that can cause blockages is if the threaded tube with the ptfe is not securely mated to the top of the nozzle when they are screwed into the block together, then seepage of molten filament can occur between them, which over time gets "burnt" into the gap and causes a blockage (or partial one). In fact by "luck" I have just had this happen to my printer this evening and I keep a stock of the threaded tube and nozzles, so I can do a "quick change".