Specialized filaments aside. Is there any reason not to use the AMS Lite for a single color print as opposed to the external spool? I do a bunch on one spool prints over the weekend then pull the filament for storage until the following weekend. Wear and tear a concern?
Nope, no reason at all. I frequently remove the external spool holder, and only put it back when I need it.
When you only where to print single color prints, I would probably go for the spool holder from the back of the printer as you don’t only save on the wear on your AMS Lite, but also on the time your printer uses to cut and pull the filament on the end of every print. But it should not be a big concern, your AMS is there to be used, and at some point, you’ll anyway need to replace some parts like the PTFE tubes and feeder. I guess you got the AMS for a reason, so enjoy it! 
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