Straight drill jig

Now you can drill straight without problems. With this jig you can make perfect 90 degrees holes with 5, 6, 8 and 10mm drill. Just use replaceable bushing to fit the drill. 
The jig also allow to make holes on the edge (45 degrees) and in the rods.   

Use support for the jig. Layer height 0.2, 3 walls and 25% infill.