Do some looking into the actual technology differences between what is being foisted on the gullible public by their 'trusted news sources', vs. what is actually available to the average guy that does not have the price of a house (or at least, a pretty decent vehicle) to spend. You pretty much need to add in a bunch of money more for software too. Jut for plastic.
Laser sintering machines are far fewer, and a bunch more expensive, as are the consumables for them, usually a proprietary blend of materials only available from the maker of the machine.
Great tools for making very very high value, parts, where there may or may not be a need to withstand a great deal of stress, eg: Bone implant models, to trial fit a part to be made before the surgery is carried out, some aircraft parts, etc.
I, frankly think that we'll see flying cars in suburbia, like was forecast for now, back in the 1970's, sooner than we will see this tech filter down to the point where it is in even some households, let alone "Tea, Earl Grey, Hot".
Too many Patents, too many liability lawyers, and too many problems without solutions.
Buy some machine tools. Once you spend some time trying to learn how to make something fairly simple, you will gain a deeper understanding of just how tough it actually is t make something like a cylinder, and have it work correctly. Further to that, you will gain a deep and abiding appreciation for being able to make a simple part that is both the correct size, and looks good!
Understanding the practical limitations of the tech you are going to use, is really, really important. The capability to design a part that CAN actually be made, seems to evade an awful lot of engineers.
The first time you see a work order come in for a 7/8" hole through 3/4 inch bar, you will understand completely!
Comparatively, most other gun parts are pretty simple!
Cheers
Trev