Build plate adhesion issues?

[cliffyk]

I have been following the numerous threads re: new Mars Pro printers and "sticking to the FEP"; and have concluded that the problem is not too much adhesion to the FEP, but rather too little adhesion to the platen (build plate). The many various, mostly failed, attempts to decrease FEP adhesion bear this out.

To put it simply, the FEP is the FEP.

OK, perhaps that was put too simply--fact is nonetheless that it is the same film on all Mars models, and many other SLA printers--however what IS different with the Pro is the finish of the build surface.

For the "Pro" it is described as being a bare aluminum (saw this elsewhere) "CNC turning CD pattern"--as opposed to the machined powder coated finish on my "Silver" April 2020 production plain ol' Mars¹:



For the "Pro" it is described as "Newly designed sandblasted":



I'm certain Elegoo did not change the surface finish twice just for the sake of change but rather to address known issues.

If I had a misbehaving "Pro" I'd do the same to it's platen as I did to my silver Mars (see the footnote), worse could happen is I'd have to buy another plate assembly ($23 on Amazon). In fact, I just now ordered one so I can play with it a bit on my Mars.

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¹ - As described above, the platen on my Mars, received on May 5th of this year, had a very smooth almost glossy powder coat finish; and I had adhesion problems right off the bat. I fixed that by scuffing that smooth surface with a 5" 320 grit disc in a random orbit sander (actually making it look like the bare somewhat rough (perhaps sandblasted?) build surface of my Longer Orange 10 which has never had adhesion problems).