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Has anyone designed a wipe pad mounts to the side of the M2?
Yes, I have. See http://www.thingiverse.com/thing:1209073 . There's a bit more to it than just adding a wipe pad mount, but even ignoring all the stuff on my web page about the twin extruder project, for a single extruder you should be able to use the right side wiper. It's not a great design, but it's a reference point for you. I don't find the wiper pad to be that useful, though (not that I've used it for very long, having made it only a few weeks ago). I find that if there is filament on the nozzle, it will just as likely push it around to the back of the nozzle as wipe it off.
Thanks for your response Tim, I'm reading up on all of the great work you have done and contributions to the M2 groups.