This is a set of bit holder inserts designed for the FLEX Stack Pack 31-Piece Impact Drill and Drive Bit Set (FAM10001-31). They should work with all of the small Stack Pack cases.

Here is the link to the one I have:
[https://amzn.to/4c1cDpQ](https://amzn.to/4c1cDpQ)           

Disclaimer: The link above is an Amazon affiliate link. If you purchase through it, it helps support me at no extra cost to you.

I really like the Stack Pack case, but I wanted a way to store more bits—especially fitting more into a single row—so I created several insert configurations to expand its capacity and flexibility.

Included Configurations

• 5 Long Bit Insert
  Similar to the original insert that comes with the case.
• 6 Long Bit Insert
• 8 Long Bit Insert
• 6 Long Bit Insert (Left Pass-Through Cutout)
  Allows longer bits or extensions to pass through on the left side.
• 6 Long Bit Insert (Right Pass-Through Cutout)
  Same as above, but with the cutout on the right side.
• 8 Short Bit Insert
  Similar to the small bit holder included in the original case.

Filament Recommendations

I’ve had great results printing these in PLA. It provides just the right amount of flex to securely hold bits while still making them easy to insert and remove.

I also tested PETG, and it works well, too. It’s slightly more flexible, but still holds the bits securely.

I haven’t tested ABS or ASA yet, but they should work fine if your printer is dialed in for those materials.

Notes / Future Ideas

I may add more configurations in the future. One idea I considered was a sideways bit holder, but I haven’t made it yet.

If there’s a specific configuration you’d like to see that isn’t included here, feel free to leave a comment—I’d be happy to look into it when I have time.