The Z-axis maximum position set in the motherboard software configuration is only honored when a G-Code file is being printed, and a G-Code "G1 Znn", "G0 Znn", or "G 28 Znn" command (where "nn" is the target Z-axis position) is encountered.
The manual controls are just that--manual controls.
IF you do runn the Z-axis up against a stop causing the stepper motor to "cog", you should perform the mechanical realignment process--loosening the platen lock screws, etc.--as with no direct feedback (no upper limit switch) the firmware will still "think" the platen moved.
The manual controls are just that--manual controls.
IF you do runn the Z-axis up against a stop causing the stepper motor to "cog", you should perform the mechanical realignment process--loosening the platen lock screws, etc.--as with no direct feedback (no upper limit switch) the firmware will still "think" the platen moved.
![[Image: 816-20120803-wide800.jpg]](http://www.paladinmicro.com/images/ForumPosts/816-20120803-wide800.jpg)