Magnetic bit holder for Gridfinity (2x2 grid footprint). Made to hold 49 ¼" hex bits and has a magnetic slot for a bit holder as well. The .3mf print file has a pause included at layer 46 to insert the magnets and a custom command to reduce the speed to 50% for layers 47-50 to ensure a clean print and adhesion over the magnets. If you are printing from then .step file, you will need to add the pause in your slicer.

I used the following magnets from Amazon for the project (https://www.amazon.com/dp/B0DMVDNY5T?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1). Note that although they are listed as 60x10x3, the actual dimensions are quite a bit smaller. The model is designed to accommodate the actual magnet size (with some space left for tolerance) and not the advertised 60x10x3.

I use a couple drops of this glue (https://www.amazon.com/dp/B0CX3KCPFD?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1) to hold the magnets in place.