CNC In A Box

[birchy]

I'm not greatly experienced in CNC, but I also bought a 3 axis 3Nm CNC kit from Zapp a few years ago and have since discovered that I could have bought the same parts much cheaper direct from China via eBay sellers. For example:

NEMA23 Stepper Motor CNC Driver 2M542 Controller | eBay
3Nm Stepper motor - for CNC Milling machine / router | eBay (this is from Zapp, but cheaper!)
480W High Power CNC Stepper/Servo Motor Driver Switching Power Supply 48V10A PSU | eBay
5 Axis CNC Breakout Board for Stepper Motor Driver with DB25 Cable | eBay

3 x Stepper Drives @ £23.88 each = £71.64
3 x 3Nm stepper motors @ £28 each = £84
1 x 48V 10A PSU = £57.29
1 x 5 axis Breakout board = £8.33

TOTAL COST: £221.26

EDIT:
Regarding lead screws (I assume you're going to use ballscrews from Chai?) I'd try to minimise the use of belts as they might introduce backlash. Go for direct drive Oldham couplings wherever possible.