Printed Great, then death...

When the motor hums is does it get very hot or is it luke warm
the issue could be on the small polulu card that controls the power to the motor it could have been close before but now got to a point where it is starving for power.

The hum is good in one way it means you are getting power there it just may not be enough. are you comfortable with making a tiny adjustment to a very tiny potentiometer if so I can sort of guide you through what you need to do. Let me know

 

sorry I mistyped that potentiometer it is an electronic piece that allows you to manually adjust voltages and or currents

A volume control knob is an example of a large one or a dimmer switch
the one I am talking about on the board is about the size of a bb

this is a picture of two polulu boards just like on your printer that board is about 1 inch long and 3/4 inch wide the circular thing in the center of the image is the potentiometer (or pot) and you see the little x on it that is a made for a tiny jewlers phillps head screw driver.

If you decide to do this you MUST find some way to mark its current amount of rotation and what you would do is simply turn this a tiny amount in one direction and then check to see if the motor operates if it does then you need to make sure it DOES NOT GET TOO HOT. I had another project that used something similar and i turned mine too far and the motor got hot enough to burn me so I had to go back an turn it back some.

So be careful if you do this
it should be set where the motor runs but does not get real hot it can get warm but not hot hot is bad
it can also get ot a point where it runs but is still barely getting enough and then the motor may start to make a screeching noise which may not happen all the time if that happens you need to do a bit more adjusting

It sounds a bit intimidating but is actually pretty simple you just have to take it slow and be careful

 

that is from your image: that is the pot the phillips head should fit in that x opening seen there are five so you have to do the correct one

 

I am not sure but after it is marked and you go to turn it make sure you do it in the smallest amount it won't take much like maybe a 1/30 of a revloution basically once you see that it is different from where you marked it that is enough. NOT MUCH AT ALL

if one direction does not work you can try other if either direction doesn't do anything thing then put it back to its original position and you will probably need to contact ROBO


ONE OTHER THING you can try before messing with this is which might be easier is
you have an extra one of these boards you should see 5 boards 1 for z 1 for x 1 for y and then 1 for e0 the extruder and a last one for E1 which would be a second extruder
swapping the board at E!1 for the one at X would be a fast check as well if you are comfortable removing the boards they just have pins that go into socket os the parent board

So you have two options

 

I believe the way you show it there is the red arrow is the x board and the yellow arrow is the E1 board which is the one you could try and swap with the z board

look to the right side(in that pic) for an E0 and anE1 those are for extruders you only use 1 right now

 

you do have an extra board I see five there and the robo uses only 4

1 for z
1 for y
1 for x
1 for extruder

 

remember very small amounts

 

ok well first off make sure the motor is free to move but turning the pritner completely off and then the axis should all move freely back and forth

When like this does the x axis go from side to side completely and smoothly

 

is there anything on the belt that can prevent it from moving freely

 

Ok I am trying to think
so when x goes positive it only goes to about 50mm and then binds up but will go easily to zero right