I have a new multi-tool shop - maybe it's the snob in me, but I prefer to call it a 'makerspace'. It was assembled for making a particular product, which has not gotten off the ground yet, but is on target for a March 2015 release.
To keep the funds flowing, and to pay my awful electric bills, taxes, and so on, I have been working on alternate revenue streams. One stream I see doing well is education. We have homeschooled 2 of our 3 sons, and the homeschool world is growing - thanks to common core.
If you shop is presentable and comfortable, you can host classes for kids. Teach them to design, how to use gear safely, and how to take an idea from start to finish. They don't learn that is school anymore.
I get $10-$20 per session (90 minute "class time" - which may or may not include machine time, based on the day's lessons) per kid. The younger kids are doing simpler work; assembling laser-cut boxes, affixing vinyl decals, easy stuff, they get about $1.00 in materials per class, and LOVE the lab.
The older kids are making more complex stuff. Mor complicated parts, assemblies, electronics, programming, etc. Many will seek extra time in the lab - and will even clean for free time! The older kids think of cooler things to do.
As for the adult set, well... same thing. I have a small stable of regulars: a guy who custom engraves walking canes, another guy who makes doll houses, a friend who is working on a stop-motion video series: all these guys do do few hours a month here. The classes for adults are growing too, as these guys want to learn to do their own prep work, rather than paying me to do the prep for them.
As for my work, I span across all our machines, each doing it's proper part...
And of course there is the usual slew of custom engravings, making molds for people (molds are VERY expensive), and more.
You just need to hustle, and find new clientele CONSTANTLY.
Good luck, and seriously consider the educational opportunities, there is good money where school budgets are slashing shop classes, and kids are just learning how to take tests.