With this little thing you can keep 12 or more hex bits in a very practical way on the Makita LXT series tools. I've been using this for over a year and has performed flawlessly so I'm confident to publish it now :)

It uses embedded magnets to hold the bits in place - and each magnet holds two bits (one above, one below). It can be mounted on either left or right side (this matters if you are left-handed or right handed) and you can still keep the clip on one side and the bits on the other.

If you don't have magnets around it can still be used: the slots have a cut-out that allows them to expand and comply to the bit, so you can print it out of flexible material (TPU). I'd still recommend the magnets as the bits can be dropped in effortlessly and the design can be adjusted for any magnet shape.

The piece mounts in the same place the clip mounts, and you can even reuse the original Makita screw (if you lost it, I believe it's an M4 12mm).

The included STL is for 12 bits (6 below, 6 above, one long to the side) but I have also included the customizer source and you can generate your own smaller/larger versions.

It prints without supports (the little triangular features are for that purpose - to avoid warp) and the magnets should be a tight fit, you just push them in and they stay there, shouldn't require glue.

I used 1/4" cylindrical neodymium magnets, they are perhaps a bit too strong (hard to remove bits with oily hands) but the design is fully customizable, you can use square, rectangular or cylindrical magnets, any diameter and height, and thus adjust for how strong you want the bits to feel.

PS: make sure to align the magnet poles when you push them in :)