Which Electronics for milling

I've bought a CNC mill on eBay as well as a Arduino 2560 Clone.

Now I am looking for other things I need. I have though of RAMPS but a kit is expensive, it has options I wouldn't need & is missing something else.

At best I would have 3 stepper outputs & one high powered dc output for the tool.
I wonder if there is a shield for that or a similarly continent solution...

RAMPS is too expensive? Other than doing a design on your own, this electronics is about the only one fitting on an Arduino (all others make the Arduino obsolete), so it's your only option. You can always parts from a generic electronics dealer, like DigiKey, Mouser, Reichelt, Farnell, RS, etc., of course and only the parts you actually need. What you need depends on the stepper drivers your CNC mill is equipped with.

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Generation 7 Electronics	Teacup Firmware	RepRap DIY

Hello, well the problem with ramps is, I want some additional means of controlling the dc motor of the tool.

So another solution + ramps would be expensive It would be nice if the rpm could be controlled by software and I have no Idea how I could do this with ramps.
I assumed that there would be a ramps equivalent for mills, but as it seems I was wrong...

Issue is: Can I control the micromot with a 2A motor shield & still get full power?
I think not since it is rated 40W / 12V...

On the other hand: can I use the outputs of the motor shield in parallel & arrive at the desired ampage? In theory it should work but there could be something I am not aware of...

Attach the DC motor to one of the heater outputs. These are usually good for 5 to 20 amps, so you can switch 40 watts easily.

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Generation 7 Electronics	Teacup Firmware	RepRap DIY

Keep in mind that most of these cheap stepper drivers are not rated for 2A continuous and they require some pretty serious heatsinking and may get damaged when opperating under that load.