Ender 3 LCD under bed mount

This is a small reworking of the original roland_iron design.

Stiffeners have been added to the structure to make the structure more stable.

The left part has also been changed to be rigidly attached to the frame of the Ender 3, not the pro version, since there is a 2040 not 4040 profile.

Print down the front side of the screen.
I used the support, but it is quite possible that you can do without them.