This is another tool holder using Sy's peglock system, extending it's modularity by adding slots to the corners of Sy's pegboard mounting plate. 

The advantages of this version are that the the peg, mounting plate and spade bit rack can all be printed flat, ensuring they are strongest in the direction of stress when mounted: Sy's mounting plate has internal overhangs in this orientation, but required no supports when printed at draft quality (0.32mm layer height) using a 0.8mm nozzle. 

Once you have printed the parts the spade bit rack should slide into the mounting plates without any post print processing: it will be stiff, but can be forced in.