all-pen holder
thingiverse
This is an all-purpose holder for your woodpecker CNC machine or any location where it can be attached. The screws can accommodate a wide variety of pens, pencils, and markers. It was inspired by "http://www.thingiverse.com/thing:1947335", which only allowed a fixed pen size and lacked precision because it didn't hold the pen securely in place. The outer barrel that supports the shaft measures 45 mm in diameter and should fit perfectly into your Chinese CNC machine; however, make sure to verify its actual diameter is indeed 45 mm in yours.
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