This is a drawing sent to a jobshop in England(http://www.wilsontools.co.uk/) that I ran into on Linked in and as far as simple goes, it has just about everything needed to make a simple part like this. Well almost, there are a couple of missing dimensions and there needs to be a material and expected finish. But something like this will get the job done.
First of all, let me say that dealing with LASERS is serious business. I have an old sign that was copied from a laser company ad that says; Dang!!! do not look into laser with remaining eye. A LASER, even a low power one, can blind you and you don’t get a second chance with blindness. Always wear eye protection with correctly tinted lenses when working with lasers.
One thing is that you don’t need fancy tools like 3D printers for prototyping. You can go a long way with just simple tools and materials. Yes, a 3D printer makes wonderful shapes and stuff, but you can do the same thing with knives, balsa wood and clay.
I’ve been a scale model builder since I was about seven or so. At least I remember having a box of kits that somebody gave me before we move to Ct in 1967. A box that was tossed in the move and I really wish hadn’t been because one of the kits in that box was first pop Starship Enterprise, but I digress. In any case I’ve been working various materials making small and large thing for a very long time.
Ran into this excellent post on designing machined parts for manufacturing. the excellent post is from OMW Corp, a job shop in California. The link is below. If you need some machining work done in CA, they look like a good place to go. It’s a good guide to how to design parts for machining. There’s no great rocket science here, just common sense and understanding the tools and how they work.