I found this on Printables created by middleagedspread @middleagedspr_513916
Gridfinity 2x2 rack for storing drillbit holders. Why go to the trouble of creating drill bit holders for your Gridfinity system, when you already have the holders - now you can use this rack to adapt the holders to your gridfinity system. The Gridfinity system was originaly designed by Zack Freedman, who originally posted all the Gridfinity accessories at https://bit.ly/3E2NxnZ.
Easy print that requires no supports when printed at draft quality (0.32mm layer height) using a 0.8mm nozzle. The rack used 67g PLA filament when printed.