Glass guard for Monkeyfab Prime3D

Simple elements that prevent glass in [Monkeyfab Prime3D](http://3dwpraktyce.pl/prime3d/) from sliding left or right.

To be screwed on heated bed platform using 3 mm screws (similar to already used ones).
You may need to drill 2 holes, at 28 mm distance.

For more information visit my blog (Polish):
http://3dwpraktyce.pl/2015/10/uciekajacy-wydruk-czyli-o-klopotach-z-platforma