Is the SKR less fully featured? Does it lag behibd in firmware updates? Is the rambo flat out better?
From a pure specification standpoint the SKR Pro wins. It has a 32-bit microprocessor vs. the 8-bit of the Rambo, the microprocessor has built-in math functionality, and the LCD is a nice upgrade. In a recent post, Ryan mentioned he was able to push his laser burning notably faster with the SKR Pro then with the Rambo. And firmware upgrades for the board are just dropping a .bin file on and SD card and rebooting. Most other boards used on the MPCNC require the firmware be compiled and uploaded via USB. On the downside, we see more issues on the forum related to the SKR Pro…LCD cabling issues, separate firmware for the LCD issues, and the like.
The Rambo is the longtime workhorse for the MPCNC. Low failure rate. Robust. Built-in drivers means there are never driver configuration issues. From the forum, I see wiring mistake made on on the Rambo board that would blow pins or voltage regulators or worse on other boards, and the Rambo comes through unscathed. And at CNC router speeds and driving your MPCNC from another computer, most of the bells and whistles of the SKR Pro don’t come into play. Rambo boards purchased from Ryan have the latest V1 firmware flashed and tend to be plug and play for an MPCNC.
Firmware for all of the V1 supported board are released at the same time.