Bosch GKF 18V-8 trim router base

This router base for the GKF18V-8 gets you a two hand operation of the router for more control when chamfering your workpieces. Furthermore you get a swiveling dust catcher, so the chips that are flying from the router bit get stoped and sucked up  to the top, where you can attach the original click and clean hose. This makes it a bit easier to work with the attached vacuum hose. The Bosch attachment has a better dust extraction performance, but it can't move unfortunately.

Whats also very nice, that it fits inside the existing inlay of the LBoxx:

The dust catcher is mounted by squeezing it and mounting it into the dedicated recess. For inside corners you have to unmount it (as with all the other solutions out there). It works just like this:

This is how the dust catcher can swivel:

There a different version depending on how you want to print it. For the part that is touching the wood I chose a PETG+PTFE to get better gliding performance. The black material is a PETG+CF for better stiffness and flatness (less shrinkage) of the base. The dust catcher should be made from a flexible material (but not as flexible as TPE). I used normal PETG for this part. It also needs some support for the large overhang of the bottom. The base is designed with some tricks so it doesn't need any supports. 

For increased bending stiffness increase bottom and top layers. I used 12 bottom and 10 top layers. 25% Infill and 4 perimeters. For the rest the 0.2mm structural profile.

Full multi material print (XL or similar)

This version has some dovetails integrated into the design to get better adhesion for dissimilar materials.

Filament change at 1mm height

Just add an filament change at 1mm height and change from the sliding material to a stiffer base material (PETG => PETG+CF for example)

normal 3D print with just one material

as normal as it can get. I'd use PLA for the increased stiffness without any abrasive material.