lol yeah.

There seems to be a gap between where the filament feed tube ends and the nozzle throat begins and it's slightly wider than the filament feed tube. So after a short while you get back pressure build up and the extruder can't push through the congealing pool of plastic and it also puts a blob on the end of the filament that prevents it from being removed via the filament feed tube.
So you have to yank the whole thing out the top of the hot end, cut the end of the filament and pull it back through the feeder tube.
Think I'll need to clean the extruder hobbed bolt as well.

It's not an inherent issue with the bowden process, definitely hotend design failure.

I'll strip it down and see if I can get some ptfe tube in there to narrow the choke point. Got some spares for the replicators that should do the job.

Other than that I'm impressed with how fast the bed and hot end actually heat up :-)

I'll get some more pics up soon.