Someone help me out here, what the heck am I missing? I have a plate with 2 identical objects (other than color) both are 103mm tall, well under any height limit there might be. Why do I continue to get an error about one of those being too tall? Why not both? or None?
Do you have “print by object” enabled in the plate settings (orange nut next to the plate)?
I’ve recreated your problem. It is also explained really well in the wiki
The problem is that you can’t have two items that are taller than the distant from the bed (when homed) to the height of the glass top. This is the top bounding box in the picture. The software won’t let you print two because of the potential of a crash. The top of the first tall part would hit the glass before the bed raises high enough to print the first layer of the second part.
You can only print one part taller than the top bounding box and it has to the the last part you print.
If you press “Ctrl+E” it will show you the order that the objects print in.
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Thank you so much for that excellent explanation of what is happening, makes complete sense. Is there a way to override this? The reason I ask is what if I remove the glass top from the printer and then print it? Wouldn’t I have the extra space then? Not arguing, just asking about an alternate method. Obviously I just moved one of them to another plate, or maybe I set one to non printable, then printed, I dont’ really remember. 
Thanks again.
Mixer
There is no way to override this via the software that I know of. You would need to physically alter/merge the gcode to do this.
I think maybe I found the way to change this default behavior, if you look in the printer settings you will find “Height to lid”. I think if you have the top removed you could change this number to lets say 180 and get twice the head room. I know that this isn’t really a problem, just more of a thought exercise. Let me know what you think.
I’ve just run into that problem. On P1s, height is default to 90 mm. measuring from tip of nozzle to glass is 140. Now, Not sure if 140 will always work, since there is the cable chain, which may or may not collide. Printing the front object first should avoid that in most cases.