Light following robot with sensitivity adjustment:

~63 parts (without 3rd wheel attachment)
Simply assembly

Note!
Print a top of prototype using 100% infill

There is a possibility to modify body of prototype. If you have any question, just ask :)

Non - printable list of materials (without electronic parts):

4x M3x25 screw
5x M3x10 screw (4x 3rd wheel + 1x Engine mount)
4x M3 pad
9x M3 hex nut
2x DC Motor with gear + plastic wheels

Anycubic

All-metal Mega

No

No

15-100%