Just finished building my BB Pro single extruder and I've got everything calibrated. Now I'm trying to get my first print done without a great deal of success. I'm trying to print the 3DBenchy file on the SD card. Everything goes fine for a while then when the print gets to about 2 or 3mm high the filament stops extruding. Print quality of this small print looks great. The reel of filament is loose and the filament itself is unwinding OK. I've cleaned off the hobgoblin and tried every pressure setting from zero up to max on he Extruder idler without success as the Extruder just stops extruding for no apparent reason. I'm using ABS filament at an Extruder temp of 230 Looking at the filament as it exits the hobgoblin there is clear evidence of indentations made by the hobgoblin but no signs of it stripping the filament Has anybody experienced the same problem or got any ideas as to what I can try next?