I placed them both in a small cup, filled it with acetone and stirred it
occasionally.  After a few minutes,  I stick a needle in the nozzle
end and finally the jammed/ABS gunk began coming out. 

I kept putting it back in the acetone filled cup for a few minutes, stirring
it...then taking it out/etc.

Finally...after 30 minutes of this when I was super sure it was clean,
I re-installed it in the Press and PRESTO!  ABS began printing out nice
and clean.

I will say this about the Press:  The ability to quickly take apart the head
assembly is a small miracle.  There's still a lot of things they could do
to improve the design...but it's a nice step in the right direction.

I just would love to figure out how to get Ninjaflex working with this machine.

Secondly, The SD2 hotend/thermistor arrangement is different from the Press. Hence the lower temp reading.

Raised temperature to 235C, still nothing. 

On my SD2,  I can extrude Ninjaflex with 215C.

I took apart the print head, held the nozzle with pliers...it accidentally
touched the side plastic part (where the calibrator is held)...that plastic
began melting.

I probably will need a needle the diameter of a syringe to try and poke/unclog
the jammed extruder head.

DO NOT USE NINJAFLEX WITH THE SD PRESS!!!