u/power-to-the-players

I've been in 3D printing for about 8 years, but I only have an old Geeetech A10 (basically an Ender 3). I'm looking to upgrade to something like a Qidi or Bambu Lab printer and take a shot at B2B printing. Has anyone made decent money on CraftCloud only working part-time? I don't mean massive amounts, but enough to make it worth your time at least.

Is it possible to make anything with a single machine?

I would probably eventually scale up, but I'm trying to test the waters a bit before I rack up huge startup costs.