Great discussion on Facebook:

Benchies on several printers, Same PLA and settings

Lots of guesses and questions on the benchies.

Well here is the printers used per benchy:

a) MonoPrice (MP) I3 flexion extruder

b) MP Select mini

c) MP I3 Stock

d) Prusa MK 2

e) Wanhao I3 +

Thanks to all who participated in this thread.

I will be posting more on these benchies, looking at each in detail and then tweaking the settings for each to get a better print.

I also have comparison using the Prusa Mk 2  at 200/100/050 Microns.