This is a modified version of my original version, the Atom2 Blade & Gluestick holder. I adapted it to hold a very nice set of hex wrenches that fit the M2 and M3 nuts used in building the Atom2. There is also a wrench that fits the odd sized "M 2/1/2" size nuts found on a couple of the components.
This holder will fit any standard 2020 extrusion column, so it can be used for many different printers. The arms that attach the holder to the printer fit tight, but they do fit.
Here's a link for the wrenches - the 4th one is for M4 nuts and these are not used by me: https://www.amazon.com/gp/product/B00CP2GGBI/ref=oh_aui_detailpage_o02_s01?ie=UTF8&psc=1