Bar for holding tools with magnets. Shown mounted to side of build enclosure. Uses 4mm circular magnets available on Amazon here:
https://www.amazon.com/gp/product/B07C4JQ2DC/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1
As made, uses 15 mm flat head wood screws, countersunk for same, so as not to penetrate enclosure cabinet. For different screws, adjust height of the bar (z) to allow for your screw length.
Magnets are pressed in, no glue needed. Holes sized appropriately for secure pressure fit.
Print file is in the downloads - high fill rate, detailed. Model file is there as well - this one is an easy print, no supports or extrusion adjustments required.
The author hasn't provided the model origin yet.