Step 2: Bill of Materials
The overall cost of the machine was above what I was expecting when I started my first machine but these costs have been spread out over the four years I have been working on the project. A comparison to entry level commercial products on the market shows that the DIY route is still a cheaper way to go. While these machines may have better performance than a home built wood framed design, there is no replacing the satisfaction of making a machine yourself. I am also unsure how flexible these are for running different driver software and overall flexibility on how you can use the machines.
ShopBot Desktop $4995 + Taxes + S&H + spindle
Laguana Swift $4900 + Taxes + S&H
Rockler CNC Shark Pro Plus $3800 + Taxes + S&H + spindle
General International i-Carver $2100 + Taxes
Lumenlab's M3 kit looks like a nice product but at $999+ S&H + software + driver the overall price will be over $1500 to get it up and running.
A note on designs titled CNC for less than $XXX dollars (usually under $200). There will always be a trade off between performance and price. Machines with very little forces on the tool can be made very cheaply (for drawing, cutting foam and 3d printing) but when cutting harder materials things have to be beefed up. These aren't bad machines but be clear with what you're building so you're not disappointed when the thing folds in half when it comes to cutting plywood. These prices also skip over several key parts, only including the major components in the price. Its amazing to see how quickly some 1/4" and 3/8" bolts add up and they certainly don't include software (or count trial versions as a permanent solution) and driver boards. Without these your $150 CNC is just an overkill paperweight.
Plywood & Metals: $158.25
Drive Line Components $261.46
Grand Total $1502.96