I've built a mendel90--it is slightly different--I am learning as I go. My problem right now is that my motors turn fine in one direction, but they just hum the other direction. this has me going crazy because they will turn in reverse just fine when backtracking after pressing the endstop. They also turn fine if I flip the connector, but then they don't go the other way. I've tried increasing the current on the stepper drivers--But no luck.
I have also tried to use an LCD+Encoder board to control it, I get the same problem.
Here is my current config file: https://docs.google.com/document/d/17GQfV6T3eDTDBd7Azu0aSYXx2wIPh8wpHcD4SQwMPOg/edit?usp=sharing
I am using RAMPS 1.4,
Normally open endstops
Jumpers pulling max-endstops to ground.