Sorry, I intended to acknowledge the good advice and focus on a point I thought was unique to maker spaces. I think you're always present, even when you have groups, in your shop. That alone makes it much safer than a typical maker space can be. Yes, we have a basic safety class. But you never know when someone will "extend" that training with an ill-advised or misunderstood Youtube video. Our shop just moved and I don't know how the new area will be set up, but in the old space the wood lathe was back-to-back with the table saw. I wouldn't use the table saw when someone was turning a bowl nor turn when someone I didn't know was using the table saw. (I figured a small chance of a kick-back or a launch to the back of the head was enough it wasn't worth the risk.) In practice, I'm not sure you can make a maker space idiot proof enough or have too much safety training. Unfortunately, for all the strengths and value of a space, your next member might be the world's "best" idiot and each member still needs to look out for themselves.