A simple to use drilling-jig for drilling perpendicular/straight holes. Even for a tool it's ugly, but it works :).
You can customize the jig for 5 different drillsizes. The jig has a big (or small) handle to keep it firm and flat.
The 5 sizes used are listed on the bottom
Use a little tolerance (%) for easier drilling.
The easiest way to use it: put the jig over your drill, place the drillpoint, put the jig down and flat to the wood without moving the drill point.
An example is added as STL.
Remember, it's a guide which will help you, not an assurance that you will drill perpendicular holes :)
For two other types of drill-jigs i made:
Easy drillguide customizable for all sides of a board: https://www.thingiverse.com/thing:3013962
Drillguide for all drillsizes: https://www.thingiverse.com/thing:3014111
If you are looking for a great dowel-jig see: https://www.thingiverse.com/thing:2964598
Do you want to add pegholes in your case or cabinet see: https://www.thingiverse.com/thing:3541489
Are there holes you want to cover (intended of course :)), see: https://www.thingiverse.com/thing:3069410
Happy woodworking :)
Designed in openscad
More information about the fantastic and challenging program OpenScad can be found here: https://en.wikibooks.org/wiki/OpenSCAD_User_Manual