Bed hits the bottom after finished a tall print

Bambu Lab X Series Bambu Lab X2D
1

Hi fellow users of X2D.

I had my first bad experience with my brand new X2D, where the bed after finishing a tall print, tried to lower ever more, resulting in the bed to hit the bottom of the printer making a loud grinding noise for a sec or two.

I have printed the same model many times successfully in my P2S which I sold in order to get the X2D and I never had any such issue. P2S knew exactly where the bed position is and never tried to lower even more the bed.

In X2D seemed like the printer lost track of where the bed is and tried to perform the usual lowering of the bed after the print’s end, resulting in that issue.

I raised a ticket to the support team, but in my surprise they just advised me to reduce the height of my model in order to avoid this problem!!! But X2D is supposed to be able to print a few centimeters more in height than the P2S. I don’t understand why I was advised to reduce the height of my model!!!

Has anyone else experienced such a problem with their X2Ds?

Thanks in advance.

2

This seems to be a fairly common problem on the P2S also.

I’m not comfortable running prints with the bed at the very bottom because, after replacing the heatbed, I could see how much strain it puts on the wires. When the bed goes all the way down, it also pushes the linear rail bearings into the rubber grommets. This is likely why some people experience the nozzle raking through infill on large prints when the bed gets near the bottom as it has to use some measure of force to get there thus maximizing the lash in the ACME nuts. Minimal but there,

It would help if Bambu made the case a little taller. That would also reduce the sharp bend in the PTFE tube as it goes into the extruder when the bed is low.

I’ve seen others reporting the same issues. Hopefully this gets addressed in a future firmware update that adjusts the minimum bed height or better homing memory on the Z.