I’m wiring up up my SKR V1.3 board. Just installed the TM 2208V3 driver pins.
I can see that the board supports five drivers, X, Y, Z, E0 , E1.
I can also see from the wiring diagram that wiring the two X and two Y motors should be done in series and not parallel. Fine, I’m not going to argue.
However after setting up X and Y and Z I have two drivers left over E0 and E1. My CNC machine doesn’t have an extruder, so why can’t those drivers be used for the second X and second Y stepper motors.
Any good reason or just not worth the trouble?
Another reason for this is that if you have a non rectilinear CNC system, and I suspect all of them are out by a tiny amount even a mm or so, you could calibrate the CNC based on a known scale and then drive the X, Y very slightly differently to compensate. I know that Klipper has a skew adjustment, suspect Marlin has as well so wonder if these unused drivers could be used for that.
I can’t imagine for a second this is a new idea, but can’t find any explanation elsewhere.
I need to work out which is the right system to use. Marlin vs Klipper.
I think I’ll try Klipper first as I like the idea of using the v1pi for the heavy lifting and keeping the SKR as a micro controller. I’ve got a Raspberry 3B lying around from an infrared project I did with my kids. The Unix stuff is the easy bit, the rest is the difficult bit, but I’m WFH so need an evening project to keep me sane
Just looked at Klipper and can see that it’s flashed from the pi. Looks interesting, Your image has Octoprint and cnc.js. Do I use your image and then download klipper and work from there?
You could. You may want to use just the octopi image. I haven’t tried klipper myself, and I don’t think there is a klipper connection in cnc.js. I am not sure it will work with klipper. There is probably a guide for getting klipper to work on an octopi though.
