Makerfarm i3v 10" Y-axis belt clamp

This belt clamp replaces the wooden belt clamp that is underneath the original Makerfarm 10" Y-bed. Use the same M3x25mm bolt with locknut, but other 2 bolts & nuts are not needed. There are 2 main variables you can change in the openscad file,
BeltGap=19; //Distance between top of belt & bottom of Y-bed
SocketOrNut=0; //0 = countersink for RoundSocket or 1 = countersink for Locknut.

I used the 19mm RoundSocket countersink, but probably could have gone to 17mm.
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