What the heck?

So, after a day of printing perfect (after getting the belt tightened) all of the sudden it has gone crazy.

When printing (or trying to) it prints the border/skirt then the first layer of the model. But it will never print the second layer... it just destroys the first! It just walks through the previous layer (destroying it) it is like it is not incrementing the Z axis when it is ready to do the 2nd layer.

You can manually raise/lower or otherwise position the head so I am puzzled on this. Models that previously printed are simply toast. nothing will print beyond the first layer.

 

try a print again and look at the the z height in Repetier see if it actually increments and send pics showing us whats going on we may be able to see something

 

I thought perhaps a bunch of pending windows updates was the culprit, but no. It is still doing it this morning.

There is little to take pictures of (although a video would be possible). Essentially it does the skirt fine and the first layer fine and then proceeds to demolish the first layer when it should be going to the next.

How/where would I see this? Would seeing the Gcode be of any use?
I can easily manually control the Z height with Repetier.

 

next to where you control the z height and the home buttons right next to each axis is its current value does the z increment after the first layer

also look below on both the threaded rod do you see nuts on those rods or are they hidden?

 

Found the Z display in Repteir.

Also think I found the problem. Looks like it had gotten reset to generate support / raft layers in one box and that was what was doing it.

I do not (did not) need raft layers on these... not sure what happened. I will on some models later so I will open a new thread to discuss that.

Thanks.