A simple and customizable tool to increase the number of peg-holes for shelf carriers or....
The standard entered values are for an IKEA Billy bookcase (STL's included). Of course these can be adjusted to your own wishes.

A few remarks:

• The distances are center to center.
• The distance between the new peg-holes can be set independently from the guiding pins. In other words, you can use different distances.
• If you want to use the tool for marking instead of instant drilling, you can decrease the values for parameters diamhole and thickplate (both 2 mm works well).

Happy pegging :)

To cover unwanted holes, see: https://www.thingiverse.com/thing:3069410
To create new pegholes from scratch and a great and simple doweling tool for the rest of your project, see: https://www.thingiverse.com/thing:2964598
To help you drilling straight/perpendicular holes, see one of the drillguides : https://www.thingiverse.com/thing:3013962

More information about the fantastic and challenging program OpenScad can be found here: https://en.wikibooks.org/wiki/OpenSCAD_User_Manual

0.2 or 0.3