Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5398239.

This is a printable replacement for the Blum Tandem BS575 drawer runners (which are no longer manufactured). These come in left/right variants, and you can mirror the model in your slicer or CAD to achieve that (as I did).

These are a slightly challenging print with thin walls and will need to be printed with supports. They will also likely need some work with a file to get things to fit and run smoothly. I've printed and used one successfully though!

The photo shows the original (cream) versus the 3D printed copy (blue).