Compact Screwdriver with Bit Storage (Parametric)

This is a remix of the EDC Bit Driver V2 by @Cheesus (thanks for sharing!) I loved the concept but I rebuilt it from scratch to fix a couple of small gripes I had with it. It's still strongly inspired by the original. Overall, it's a bit bigger but can contain more bits, should be way sturdier and is parametric so you can make it as small or big as you want. I printed mine to store 9 bits vs the original's 6. You could easily make a 12-bit version or even a 3-bit version if you want a really compact screwdriver.

It's great for EDC but also when you need a short screwdriver where normal full-size ones won't fit!

Test parts are provided so that you can make sure the tolerances are just right before printing the actual thing.

Features

• Parametric (tune for a perfect fit and any number of bits you want)
• Provided STLs accommodate 6 or 9 stored bits
• The bit goes deep in the driver tip for maximum strength under torque
• Thick walls (adjustable) and internal fillet for rigidity and torque strength
• There's a hole in the cap for hanging / clipping it to something (fits paracord)
• Optional magnet (recommended) to keep bits in place. As this is a parametric model, you can tweak it to fit the size of magnet you have.

Customization Instructions

There are lots of parameters than you can customize but the most relevant one is the bit_count_per_track. When you change parameters, it's normal for Fusion 360 to compute for a while because the knurling pattern is quite CPU intensive. Just be patient. You can suppress the knurling features in the timeline (just click on one of the knurling faces to figure out which timeline item to suppress) to facilitate other adjustments and reactivate them when you're happy with the result.

Printing Instructions

These settings might be a bit overkill, but I wanted my screwdriver to be very strong so I went with:

• 5 perimeters for the body
• 50% infill for all parts

Assembly Instructions

1. Optional but recommended: insert a (by default) 6mm magnet with a drop of superglue in the bit hole and press it in place.
2. Also optional is adding small bits of slim foam at the bottom of the body's “container” hole and at the bottom of each of the core's tracks. This will prevent the bits from making noise when you carry the screwdriver.
3. Insert your bits in the core
4. Screw the two parts together