Hi John.
I agree that 3 boards is better for fast/less expensive swapout. A spare board would only be $40, great if you have something(s) you need to get made fast, blow a board and have a fairly tight budget. OTOH a single board minimizes interconnect wiring and theres no need for a breakout board (not that one is required), which is better suited for people with less wiring experience, and better complies with the KISS method for initial assembly. Personal preference, and like the other aspects of CNC, size, speed, software, stepper or servo, cost to build... everyone should choose what suite their needs the best.
mike |