I am looking at buying a K40 laser off of ebay and seeing the thousands of them listed, I was wondering if someone had a recommendation on which one to look at over the others. I have been using cnc routers for quite awhile but don't know much about lasers. I understand that the K40 is a no frills, bare bones machine that needs upgrades right out of the box. It is the only one that is in my budget right now and I just want to use it to expand on my capabilities with my other cnc and use it to learn with until I can move up to a better machine. It is going to be a hobbyist machine and I am fully aware that it is not a great machine.
Looking for a little guidance to figure out which one might be best to use as a starting platform.