Bigger base plate to hold the router with both hands – especially handy on narrow edges.
To get an easy going router, print on a smooth bed sheet if possible.
Prints with PETG or PLA, 0.3 mm layer height and at least 25% infill (grid).
The grip can be found here:
https://www.printables.com/model/401870-another-knob-for-the-extended-router-base
The author marked this model as their own original creation.