ordbot spool holder

These are spool holders that mount on the ends of the makerslide on an ordbot. (I designed them to replace the extrusion endcaps). There are two versions of the right mount. The _pin version has a pin compatible with [thing:151515](http://www.thingiverse.com/thing:151515). If you don't want the panel hinge pin use the "_rt" instead.

((note: this pin in [thing:151515](http://www.thingiverse.com/thing:151515) will not fit within the walls on this thing which means you can't just glue it, yo