Great catch, Billy. Sent alone, the "M92" command (no 'E') will not do anything. When used in conjunction with values, "M92 Xa.aaa Yb.bbb Zc.ccc Ed.ddd" will set the X, Y, Z, and E values to a.aa, b.bb, c.cc, and d.dd, respectively. You can leave out any of the X, Y, Z, or E values and it will leave those specific axes alone. To retrieve the current settings, type M501 with no arguments, and the firmware will echo all of the current default settings, including the steps per mm.
As always, please feel free to edit the wiki in a way you think will help the next person to use it. Let us know at email@example.com if you run into any issues - or if you need to recover changed you made by mistake - we can revert the changes for you. It looks like you had success in getting the step back though - thanks!
There are usually 3 screws for each Panduit length. Two for the very short ones. If you look at the image at the top of the guide carefully, you can see the overall arrangement of the Panduits on Gigabot.
Sorry to be slow to respond to you on this one. You are very observant. That slot within the rail serves no purpose, except to sometimes provide a slot for an allen wrench to fit into while rotating (especially on the Y-axis rails while tightening belts). All Z-uprights are interchangable. Be sure that they are truly square to the side rails though - any difference in distance between Z-uprights over the travel of the entire Z-axis could cause problems.
We made the decision to change to the shallow panduit for that location after you received your kit. It really doesn't matter, it just makes for a cleaner system with smaller cable management trays. However, the deep panduit is actually more useful if you intend to customize your bot, or if you have supplied your own wiring - which I think will both apply to you soon. :)
Good call, Kurt. I took a new picture and tried to reword. If you have a better way to describe that, have at it. A further quote from our wiki at http://wiki.re3dprinting.com (soon to be http://wiki.re3d.org) is to "Look down filament guide hole on filament guide shelf (installed during terminal box attachment). Ensure hole is directly above filament entrance to extruder. If it is offset, remove terminal box and flip filament guide shelf such that filament will guide directly into extruder."
Obviously you can't do that until the extruder is attached, but I think it helps to double-check once it is later.
Thanks for the comment - Keep them coming!