Simple Slider
thingiverse
A Simple Linear Guide Using low-cost, plastic-coated ball bearings is the way to go http://www.aliexpress.com/item/Door-pulley-bearing-plastic-covered-mute-bearing-0518T-5-18-6-mm-free-shipping/666071303.html and pairing them with basic P5 20*20mm profiles makes the design easy.
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