all-pen holder

this is an all-pen holder for your woodpecker cnc machine or any place where it can be attached. The screws can hold many type of pens, pencils and markers. It was inspired from "http://www.thingiverse.com/thing:1947335" which only allowed a fixed pen size and was not precise since it didn't hold the pen. The outer barrel which supports the shaft is 45 mm of diameter and it should fit perfectly in the Chinese cnc machine but make sure it is actually that diameter in yours.