Many people have these nice little bit set boxes. But no one really likes to carry them around. So the bit you need is, most of the time, somewhere else.

I decided to roll my own belt clip carabiner bit holder and took some inspiration from things 85890 and 2443 as well as these commercial belt clip bit holders from Berner, Makita, Bahco, and Würth.

The result is a holder with the following
Features

• 20 or 30 slots
• bits are held by magnets
• hole to apply a key ring (and carabiner)
• add-on to store a bit holder along with slots for two more bits
• add-on to hold a Wera 816 RA bitholding ratcheting screwdriver

What to print?

• Holder without the add-on: Print STLs LEFT&RIGHT and MIDDLE.
• Holder with add-on: Print STLs LEFT&RIGHT and ADD-ON.
• Wera add-on: Print STL WERA 816 RA.

Payload
Bitholder 20 slots

• 20 x 5x3mm magnets. I only had 5x1mm magnets from here so I stacked three of them. Worked like a charm.
• 3 x M3x20 socket head cap screws with hex drive
• 3 x M3 nut

Bitholder 30 slots

• 30 x 5x3mm magnets. I only had 5x1mm magnets from here so I stacked three of them. Worked like a charm.
• 4 x M3x20 socket head cap screws with hex drive
• 4 x M3 nut

Add-on

• 3 x 8x5mm magnets. Actually, the ones I used from here were 8x4.7mm.

Wera 816 RA holder

• 1 x 8x5mm magnet
• 1 x 5x4mm magnet. Or any combination of magnets with 5mm diameter that stack up to the required height.

Assembly
You can watch me assemble the holder in this Magnet Bit Holder Assembly video on YouTube.

Decide which version you want, then print the corresponding 3D parts. If you want the add-on you will have to print it with support.

Either with or without add-on: The 5x3mm magnets have to be (super) glued into the holes of the middle part.

If you want the add-on you should glue the three 8x5mm magnets first then glue the add-on to the middle part of the holder.

If you happen to have a Wera 816 RA or comparable screwdriver there is an additional screwdriver-holder that slides into the add-on and is held in place by magnets. You will need another 8x4,7mm magnet as well as one 5x4mm magnet. Or four 5x1mm magnets or whatever combination stacks up to 4mm. Print the part, put the magnets into place, slide the holder in on the bottom side of the add-on, and push the screwdriver into the holder. Here is a video of the assembly.