"1. Could someone provide me with a list of spare parts that are needed for this system? Nozzles, heaters... anything that a typical user finds is a much needed spare"
-> 2x PTFE Coupler (or get 1x Hot end pack and 1xPTFE coupler) after around 1100 hours of printing with the UM2 and knowing what I know now only the PTFE coupler fails
"2. Which material is easier/ more forgiving to build with, PLA or ABS? "
-> PLA
"3. Are there any must do upgrades that should be done prior to setting this up in the school. "
-> #1 if there is temperature variation and/or underextrusion, have a look on this link: http://umforum.ultimaker.com/index.php?/topic/6517-um2-temperature-vary/
If this works well, I can imagine there is no need to change to iRoberts extruder
-> #2 it could be resoldering is necessary but I am sure you are capable to fix it.
Re software, have a look at openscad, too.
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tommyph1208 55
+1 for PLA as the easiest print material... I also have a UM1, but If you go with the UM2, from reading the forums, I will say that you would probably want to print a new feeder (check the "Modifications and Hacks" section) and maybe a low-friction spool holder...
If any of the very young children of the school should ever get the chance to play with it as well, you should consider the Doodle3d that Ultimaker also sells here on the site:
http://www.doodle3d.com/
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