Several weeks ago, I went to calibrate my Prusa. Things were going fine till suddenly the X axis would no longer move in the negative direction.
Pressing -X steps results in no movement.
Pressing Home (Using Pronterface) will send the X axis in the positive direction until it hits the physical limit of the positive direction and will continue to attempt to move it until I power off
in order to trouble shoot, I did the following:
- switched Y stepper cable with X stepper cable. The behavior (negative direction not working) follows the axis. IE, now that the cables are switched, the Y axis will go in the positive direction, but not the negative. Restored cabling to original connections
- replaced the X axis polulu - X axis positive direction works, but not negative direction. Replaced original polulu
- replaced the RAMPS board - X axis positive direction works, but not negative direction. Replaced original RAMPS
- uploaded firmware with no changes. no change in behavior
At this point I powered everything off.
Today (Jan 1, 2016) I powered the unit on, loaded pronterface, connected to the Prusa and pressed “HOME” and everything worked. Thinking that I either lost my mind a few weeks ago or that the Prusa Fairy visited me one night without telling me, I set out to print a calibration file. While it did print (which included -X axis movement), I knew I was going to have to tune it a bit so I commenced to calibrate the machine.
I spent some time calibrating the unit for the Z and the Y axis, uploading the firmware changes as I went along. However, when I went to calibrate the X axis (the unit has been powered on for several hours at this point), it would not move in the -X direction.
I repeated the aforementioned trouble shooting steps again (except step 4 since I had been uploading firmware updates as I calibrated the machine) and have found no solution. I know what you’re thinking … you are thinking it’s the arduino. I kinda am too, but I’m hoping someone on here has solved this problem without replacing the arduino because, for some reason, the wife thinks buying groceries this month is important thus leaving me without disposable income for the foreseeable future.
The unit will be powered off overnight and I will see what it does first thing in the morning, but if you have any suggestions or ideas I would appreciate hearing from you in the mean time…as I sit in my chair…rocking back and forth…sobbing like a baby