I use my dry wipe marker to write on the lack table door what print file is in each of my SD cards (the SD card holder is here https://www.prusaprinters.org/prints/31652-sd-card-holder).

As I progress through these and add more (when I'm busy), I wipe the old writing off with my dry wipe eraser (whiteboard eraser and holster is here https://www.prusaprinters.org/prints/32753-lacktable-whiteboard-eraser-holster )

I couldn't find a suitable solution for this need that exactly fit my purpose so I designed a new one.

The holder is 50mm wide so fits nicely on the Lack legs. It holds my 16mm marker nicely.

This works surprisingly well.

Print instructions

No supports needed.
Print it with the base facing the bed.
Use any material (I favor PETG)
I believe I used a 0.2mm layer height, but I doubt this is critical.