In this way the owner is informed that the alert went off atleast once during his/her absence. Components R1 (100R) is added to limit the operating current of the LCD backlight unit, and P1 (10K) is ...

Uses Arduino Mega, Nema 17 stepper motors (1 for X axis, 2 for Y axis, 1 for Z axis) and hobby servo for operating the claw mechanism. 2 endstop switches for X and Y axes, 1 for Z axis. LED lights ...

They are not the stiffest machines, but lots of folk are making pcbs on them. Engineer in Wonderland CNC-related blogs are indexed here. Something that is missing when they are bought is automatic end ...