Yesterday I received in the mail, my Gradus M1 Pro Grbl CNC controller. It accepts pololu style drivers like the SD8825, SD6128, and A4988. It also accepts the newly developed Bigfoot driver profile which features a larger footprint to accommodate higher current drivers like the BSD4989 running at 4A. I ordered one with the Bigfoot BSD109A drivers which can handle 3A per phase and up to 48v.
Only 3 of the 4 BSD109A drivers were shipped, so I contacted Panucatt customer support about the missing driver. They have been good to work with in the past. (Edit: I spoke too soon. It has been 18 days since I contacted them on Aug 5th. I contacted them again 6 days ago. Still no reply back.) I got in on the Kickstarter that they produced for their RE-ARM Controller for Ramps. “RE-ARM is a 100Mhz, 32-bit ARM controller with the popular Arduino MEGA footprint. It’s a plug-in replacement for the Arduino Mega in your RAMPS setup for a quick and easy upgrade to 32-bit goodness.”
I am looking at using the Gradus M1 Pro in my X-Carve build. The nema 23 steppers from Stepperonline that I have ordered are rated at 2.8A per phase. So the Gradus M1 Pro with the Bigfoot drivers should be a good fit.