Makita wrench grip

The 2 collet wrenches that came with the Makita router are just plain metal.  Repeated use with both of them to change bits gets annoying.  This is a simple solution and they feel great in your hands.

Print with 4 walls and 50% infill

Use a dab of oil or lube of some sort on the end of the wrench and drive it into the handle with a mallet.  It should be a pretty snug fit.

There are multiple options for how much texture the grip has.