CNC Router vs 3D Printer

[Andrew Schreiber]

Originally Posted by DampRobot

Lots of people are making a huge deal out of the "3D printing revolution," but the truth of the matter is 3D printers are only good for very small run, complex, non structural plastic parts, like trial electronics cases or miniature sculptures. There will be no real manufacturing revolution (as some reporters and politicians are hoping for) unless 3D printers start printing much more durable materials, become much much faster, or become able to print electronics as well as plastic materials. For the moment though, I'd prefer using a subtractive CNC tool (like a router) any day of the week.

You are looking at the "3D Printing Revolution" through a very jaded lens. Allow me to walk you through the process I'm going through right now for some structural parts:

Step 1: CAD Parts
Step 2: Print Parts
Step 3: Assemble parts
Step 4: Simulate loading to failure
If acceptable failure continue, else go back to Step 1 and iterate.
Step 5: Depending on part produce part a mold or make on router/mill

Because I have the 3d printer (and can run it unattended) I can hit print and go work on other things. This means I can iterate a lot faster on parts. And sometimes it's far easier to see problems with a design when you can hold it in your hand.

If you look at it as the end of the manufacturing process it's fairly useless. If you look at it as a step in the engineering process it's much more useful.