I have just being verifying my statistics on my 3D printer.

This Thor project already has taken 174 hour print and 3 roles of ABS plastic of 0.75 Kg (21 Euro's each).
This is 2.21 Kg plastic and my cost around €50.

After next weekend I need to add 20H printing so the total will become 194 hours.

The 7 stepper motors costed me around €140.

The Ultratronics v1.0 pro board €150

The big ball bearing was €50 if I recall.

100W power supply was €100.

The total cost at this moment seems to be >€500 at this moment probably around €600 so far.
Total waste is €50 (plastic) €550 total reusable.

But every cent is worth the experience I get back and all components can be recycled for newer projects. Not to say the enormous joy you get when you build it with your own hands.