Multiboard Multipurpose Holder - 3-20mm Hole

I really liked the design and style of the HSW Multi-purpose Holder, but I use multiboard, so I recreated it for myself. Right now I have 3-17mm, but will work on adding the larger sizes too. The 3-20mm fit in the space of a single multiboard tile, so they fit perfectly side-by-side. To get the connections I like, I have 2 versions. The first uses my Snap Anywhere Connector so that I can make a full sized Octagon for the back face, the other uses the large bolt. The Bolt is shortened from the original design so that it doesn't stick out, and is placed such that it should tighten down just as the octagon reaches the appropriate orientation and snugness. Note that the Bolt version has a flat bottom. There is a supplied modifier to be applied to it to provide support for the print.