On the topic of a separate power supply, I found this at a local electronics store: 12-24 volt, where I can pick from several values:
Universal AC Power Adapter Charger with 12V / 15V / 16V / 18V / 19V / 20V / 24V Output 90W Multi-Function Universal switching mode AC Power Adapter Charger with 12V / 15V / 16V / 18V / 19V / 20V / 24V output. Suitable for a variety of different types of laptop and LCD monitors. Specification...
aa-e.com
It's a 1.5 amp supply, similar to a PC laptop, with a switch on the side to select the voltage.
My question is do I tie the negative of this supply to the negative of say a 24 V 20 amp supply used to run the stepper motors, via a TB6600 stepper driver? I like the idea of separate supplies, and appreciate your thoughts, as I haven't even unboxed my Masso, just reading bug eyed !!!