As above, I'd be looking at the DWS X-FAB machine (If they have finally made it available - They first showed it a couple of years ago.)

If you want an industrial machine we have an old EOS SLA machine (250mm cubed) which could be available for not too much money.

It had a lot of advantages over the bottom firing lasers/projectors such as those suggested. It just needs a lot more investment in resin to start with.