Fun stuff! I don't have etching equipment but I once used a CNC mill to route out & drill a small PCB for a project. I should look into an etching setup some day.
CNC routing PCBs.. cool, never heard of that approach before!
As for etching setups, there sure are really advanced and expensive stuff available, but I've gone for the cheap option. Haven't mentioned much about the etching part, but I might as well, if someone is curious..
Stuff to have: access to a decent laser printer; toner transfer paper (got cheap china stuff); copper clad laminate; clothes iron for the toner transfer; etching powder (ferric cloride); plastic containers for etching and water baths; protective glasses and gloves; something to put the etching liquid in after use; IPA; Acetone; some rags; a pillar drill for making the holes (like a mounted dremel).
The process:
* Print the circuit design onto toner transfer paper. If the transfer paper jams the printer because it's too flimsy, use paper based adhesive tape to mount the leading edge to regular paper.
* Sand and clean the copper side of the laminate. Use fine grit paper or steel wool and then a rag doused with isopropyl alcohol.
* Iron the toner onto the laminate. Make sure everything lines up properly. First press the iron as evenly as possible over the paper, then go over it thoroughly with the edge of the iron to really make the toner stick.
* Let the laminate cool down a bit. Don't burn yourself handling it.
* Put the laminate and paper in water. When the paper loosens up, slowly and carefully peel it off the laminate, and make sure the toner stays on the copper. If it fails, just wipe toner off with acetone and start over from step one.
* Put on protective gear.
* Pour warm water in the etching container and get the powder in. Let it dissolve.
* Put the laminate in the etching liquid and start agitating. Just keep the liquid on motion over the copper until the copper is gone. (Don't over-etch!)
* When it's done, put it in water to stop the etching.
* Clean the toner off the traces with acetone and rags
* Admire it for a while and post on Instagram
* Drill the holes. Carefully. Don't get sloppy.
* That's it!
