Remixed the best anchor I found on MakerWorld with the following:

• Logo:
  Swapped out the cable icon with triangle icon that's ready for AMS use.
• Magnet Super Saiyan Strength:
  Deepened the recess to hold 4x 20x5x2mm bar magnets for a powerful attachment to your desk.
  I tried a stack of 5 but it was producing worse exterior results in the final print. (Basically the hull layer line that most/all Benchies have.) I also tried using a single 20x10x5mm bar instead of a stack of 4 or 5, but the polarity was horizontal instead of vertical and although it worked, it didn't match the same configuration used in the official Secretlabs anchors. Stacks of 4x of the 20x5x2mm works great, matches SL anchors and holds really well.
• Design:
  Shortened the overall height to match the Secretlab anchors. (They have a little less than 1mm of the magnet exposed.)
• Clean-up:
  Removed the magnet recess side-gap from original model as it isn't needed and would show up in the exterior walls as an imperfection.

Magnets used: 20x5x2mm Bar Magnets
You will need 8 per anchor.

Easiest method to assemble these, with matching polarities to Secretlab anchors:

• Put 2 stacks of 4 magnets on top of an existing SL anchor (which will align the polarities)
• Add glue to printed anchor magnet recesses
• Place printed anchor over the 2 stacks
• Slide it off, flip upside down and place on desktop so the magnets pull tightly against the printed anchor while the glue sets. (Add paper towel in-between desk and printed anchors if worried about glue spillages.)

Printing:

• I used all Bambu PLA filaments in my prints that are in the photos above. I tried out Silk White and Silk Gold but ended up favoring Matte Black, Matte White, Basic Red and Metal Iridium Gold Metallic.
• I printed most of my anchors on a Lightyear G10 plate on X1C. All the Red and Black anchors in my photos were printed on a Bambu High Temp Plate on A1 mini. The High Temp plate makes a more uniform but muted layer, while the G10 ends up as a mix between a High Temp plate and a glass bed.
• My primary print profile uses the 0.16mm High Quality preset as a base. I reversed the top and bottom layer properties since this is printed upside down and aligned the seam at the back. I also included a skirt loop because I'm a fan.
• If you use the STL directly, you'll need to split the model with the ‘to parts’ option in Bambu Studio to have access to the icon parts for coloring. (Or you can open the 3MF file and they're already separated and colored.)
• You can modify the colors in the 3MF file in Bambu Studio or just send to the printer and assign the colors at that point.