Ultimaker 3 Extended printcore 2 problem

[wmatchett 0]

My Ultimaker 3 Extended is having trouble printing with printcore 2.  I have auto leveled twice with the same result.  The nozzle is so close to the build plate that filament won't extrude.  It does not scratch the glass but the glue is wiped clean.  I have verified the nozzle is not blocked - it extrudes when changing or loading filament and I have done a cold pull with a clean filament end coming out.

 

Printcore 1 prints fine.  How do I fix this?

[Josnoww 6]

Hi @wmatchett,

 

I am sorry to hear you are having trouble with you UM3E. Unfortunately there are multiple things that could be happening. Here is a couple of things you can try:

1. It is very rare, but sometimes some material from previous prints can get stuck in the Z limit switch. This can cause the homing to be inconsistent and therefore the nozzle can end up too close to the glass plate. You can check this by raising the bed. If you look under it there is a small square hole in the back to the left side of the spindle. It might be difficult to see without a light if there is material stuck in there.
2. You could try changing the screws on the bottom of the buildplate.
3. Try to reinsert the printcores, make sure they are properly seated.

I hope this helps for you, if not please let me know. 

 

Jos 

[wmatchett 0]

Thanks for the info.  #`1 and #2 would apply to both printcores, correct?  As I said before there is only a problem with printcore 2.

 

1. The Z limit switch looks clear - nothing blocking it.

2. This would change the level of BOTH printcores, which does not help.  Printcore 1 prints just fine.  I did not change the screws.

3. I reinserted 2 and it clicked into place.  The problem still exists,

[wmatchett 0]

For a workaround I added .2mm to the first layer.  This makes layer 1 of printcore 1 too thick, but printcore 2 prints good.

[wmatchett 0]

Does anyone have a solution to this?