Geeetech prusa bed calibration clip 8mm

edit 21/12/12 : added clearance for 1mm washer, now it's perfectly sized and compatible with 8mm plastic, acrylic or wood frame
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just a 8mm spaced for the Acrylic version of the Geeetech Prusa i3 model B

it's a remix of :
Geeetech prusa bed calibration clip
http://www.thingiverse.com/thing:1959240

scaled with sketchup, no particular printing profile needed