LTT Combined Screwdriver Magnetic Case

I really liked MelSK’s design for the standard LTT screwdriver and used it until I acquired the stubby and shaft extension. Wanting a way to store all of them in one case, I decided to expand on the original concept while still utilizing the magnetic bit holders.

Everything prints without supports. To insert the magnets into the case bottom, you’ll need to add a pause or color change at layer 65 (this should be right before the holes close up—see the last picture). Before resuming the print, add a drop of super glue in each hole before inserting the magnet. This ensures the magnet stays in place and doesn’t attach to the nozzle when the printer begins printing over it.

The bit holders are structurally the same as MelSK’s, but I updated them with labels for each of the extra bit sets sold by LTT (minus the standard set as I keep that set in the screwdrivers). The set name is labeled on the front, and each bit size is labeled on the back. You’ll need to add a pause or color change at layer 21 and insert the magnets when the print stops. If you have a steel bed, it helps keep the magnets in place before the printer prints over them. I used 12 magnets per bit holder, as I believe filling all the slots helps keep each bit secured magnetically. However, you could likely get by with 8 per bit holder. I found a pack of 100 on Amazon for around $15–$20 USD.

I also recommend ensuring that all the magnets in the case bottom face the same direction. Before resuming the print, check that your bit holders are oriented the opposite way. This is an obvious step, but I once neglected to double-check and ended up with misaligned magnets.

Additionally, I’ve included a template for the inside of the case top. In an original prototype without block in the top of the case to hold things in place, I lined mine with 1mm-thick adhesive-backed felt from Amazon, which helps reduce rattling noise, as the standard screwdriver and shaft extension aren’t perfectly held in place between the case bottom and top. The template also includes the cutouts for the blocks so you can cut those out, but I have yet to do so myself. 

I printed everything with a 0.4mm nozzle at a 0.2mm layer height. For the case parts, I used a gyroid infill pattern to help add a bit of strength and minimize shrinkage or warping issues. I personally used ABS for the larger case parts and PETG for the hinges and latches for a bit of flexibility with strength.

Additional Hardware Needed:

• 8 M3x20mm machine screws

• 60 8x3mm cylindrical magnets (12 for the case bottom and 12 for each bit holder × 4 = 48)