Firefly clip and hinge modification for the ModDoc motor Arm

I revisited the clip and hinge from the firefly for the Mod Doc printable motor arm.

I wasn'nt quite satisfied with the one from Mod doc, so I remixed it. No offense to the original design, it really just is details in the clipping quality...and a little bit esthetics :)

2 versions from the hinge are available. The original one from Mod_doc showed white traces, giving to believed the part had to be reinforced.

I'll have to test all thaht before validating the parts.

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Update 07/12