I had a bit of a struggle getting the machine to print the bottom paste layer for me, possibly I just didn't find the documentation on how to so it.
I recently had to make a small mod to some lithium battery boards I'd made back in 2013. The original design was in Eagle, then I'd panelized them using DesignSpark, as I was playing around with it then and it made it very easy to panelize and go beyond the size limitations of my Eagle version.
I had the blank PCBs, 4 to a panel, and the original Gerbers I had sent off for fabrication. They have the through hole components (battery holder, connectors) on the component (top) side, and the SMT components (battery charger IC and passives) on the bottom.
By default DesignSpark names all the Gerbers as .GBR, and the one I wanted was named "USB_Batt_smt_panels- Bottom Copper (Paste).gbr"
The Voltera software read it and the drills in ok, but displayed it as the top layer, so I couldn't line it up to print the paste. I tried renaming it to have a .GPB suffix but that didn't help, it still treated it as top paste. I was really hoping to find a simple way to manually mirror it, or to tell the software that this was the bottom paste layer?
In the end I had to go back to DesignSpark, install the version upgrades they had done over the intervening 4 years, read in the original panelized project, and output the Gerber using the "mirror" option, before I could use the V-One to apply the paste.
After which I belatedly realized that I wouldn't be able to use the guillotine to cut the boards apart once they had the components attached, so I would have to cut them first and then add the paste, which meant I wasn't really saving to much time, having to align each small board individually. And I had to go back to the pre-panelized version and export mirrored bottom paste Gerbers for it!
Anyway, question is, do we have, or can we have, and easy way to tell the software this is a bottom paste so please flip the board?