content: PLA actually smells slightly sweet when printing. Unless you plan on getting much use out of it, because of the learning curve, I encourage you to use a print shop.  If you have a CNC you have a lot of the know how. But there is a lot of knowledge to pick up along the way. Unless you want to pick up one of the higher end commercial offers, which is 99% out of the box,you can pick up the rest as you go. Worth pointing out that a 3d printer can be complimentary to your CNC efforts. Throwing away a couple of bucks of plastic is much cheaper than throwing away $40 bucks worth of quality stock. While not as precise as CNC, it still allows you to do test fits and prototypes a heck of a lot cheaper. It also segues into metal casting. Something for everyone...