Just bought a Workbee from China, I'm able to make it work but after running the stepper motors continuously for more than 30 seconds it will start to stall.
I've used an extension cord wire to power the CNC shield
Motor power supply 24V , rated current 14.6A
4 Motors: Nema 23, 3.6V , rated current 3A
Driver: polulo DRV8825
Arduino running GBRL with CNC shield
micro step : half
motor acceleration 100 mm /s^2
feed rate 2000 mm per minute