Functional 3D Printed Mill
Purchased components are listed below, these are McMaster-Carr part numbers with the exception of the router which I purchased on Amazon. You could definitely source cheaper hardware, but the bolts that are labeled (Fully Threaded) need to be. The router is just a cheap one so you may want a better router, or already have one. I included a step file of that part so that you can modify to fit another router.
When assembling I would recommend tapping the ½-13 holes if you have a tap, I was able to assemble without it, but it took some working back and forth to make it smooth, and WD-40 can help as well. The second one I built I tapped the holes after printing and it made it a lot easier.
½-13 Hex Head Bolts
(2) 92800A407 - 10” Long (Fully Threaded)
(10) 92240A715 - 1-1/2” Long (Comes in 10 pack)
(1) 92800A408 - 12” Long (Fully Threaded)
(1) 92240A740 - 8” Long (Fully Threaded)
(1) 92240A728 - 4” Long (Fully Threaded)
(4) 92240A710 – ¾” Long (Comes in 10 pack)
3/8-16 Hex Head Bolts
(4) 92240A622 – ¾” Long (Comes in 25 pack)
1/2-13 Socket Head Cap Screw
(1) 91251A722 - 2-1/2” Long (Comes in 10 pack)
Set Screw Shaft Collar
(3) 9414T11
Router
https://www.amazon.com/dp/B094VSC1GT?ref=ppx_yo2ov_dt_b_product_details&th=1