Is there any particular reason why one shouldn’t use sensorless end stops for the Y axis given that the X and Z axes are doing just that?
It probably depends on whether or not you are using an skr pro 1.2 board or not and have the sensorless pin bent out of the way… Since you are using klipper, you can enable it if you want and aren’t using that board. (this may or not be relevant, so please excuse and ignore if irrelevant).
The general guidance on using sensorless homing on the cnc machines is that they’re not repeatable enough for things like tool changes (where you might home multiple times in a single job and need them to be exact). This is probably less of an issue with a 3D printer, assuming you’re homing at the start of each job and only then, so a slight variation in the homing accuracy won’t impact the print quality.
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(For clarity, this is for a MP3DPv5, not a CNC)
Thanks for the replies. I’m using a BTT Octopus (mainly because I already had it) with TMC2209 stepper drivers. Since the v5 doesn’t seem to have an X end stop by design (at lease I don’t see one referenced anywhere other than a brief discussion in the build forums that doesn’t seem to have made it into the final design), it won’t be possible to get dead-on accurate repeatability anyway as I see it… or am I missing something?
The x endstop is on the back left of the hot end trolley. It gets routed with the heater wires to the hot end. Ill post a pic later if you want.
Ah, OK, I see it in the CAD files now… I don’t know how I missed that. In any case, the build steps on the docs page seem to stop at the step of installing the belt, so perhaps that detail will be included if the build steps are finished in the future. Thanks for the clarification!
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I’ve had troubles with X/Y sensorless homing on a corXY machine
As moving in Y requires the action from 2 motors, sensorless homing tends to be quite finnicky with those setups
More generally, I also find that the hassle of differnet board/drivers/pins comnination and fine tuning of the sensibility are just not worth it vs just installing a switch…