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I increased the size of the hole at the output side of the extruder by a little under 0.1mm and that has (so far, knock wood) totally fixed the problem. Before I did that I experimented and mounted the block in a vise and tried to pull my entire spool of filament through it and wind it onto another ...

Perhaps I may have found the problem. The tollerance of the hole in the aluminum block at the output side of the hobb wheel is so tight that it can become jammed. My previous technique for clearing jams was a little ham handed and I never noticed the problem but on the last run it jammed so badly ...

OK. I manually ran the python script that enggmaug provided (thank you) against an offending G-Code and it cam back with "Clean Code." I checked the hotend temperature with a Fluke Thermocouple and it was +/- 2 degrees C of what the thermistor reads I totally disabled retraction just to see if ...

Thank you for all the suggestions.
I will try them and report what I find.
RKM

I am incredibly frustrated at this point. I have NEVER (n over a month) managed a complete large print (I have done a few small objects). Every time at some point the hobb wheel gouges into the filament and will not push any more. I have tried both ABS and PLA from two different high quality vendors ...

Added vertical tube running to top to make a conduit for easily running wires "up top".

Got her up and running in two long days of building over the weekend. It all went together well and I found the kit nicely designed. It is possible my fingertips may never grow back after dealing with all the masking paper though :) I did make a couple of changes (as all tinkerers do). As the design ...