A remix of barebaric's design. The primary difference is that it's easier to insert/remove the wire comb into the slots, but it's still secure enough that it doesn't fall out (fitting mechanism is shown in one of the images). Just make sure to insert/remove the comb by pushing it in/pulling it out vertically, angling it at all makes it hard.

Fusion 360 files are included if you want to make changes.

Printed on a Bambu P1P with PLA with 0.16 layer height. I didn't try to print this “as is”, but it might work for you. In my slicer (Bambu Studio) I reduced the infill to 5% for everything except the bottom part of the wire comb, which I put at 20% for some durability. I also changed “Wall loops” to one, but only for the part where the slots are. I did this so that the sides of the slots wouldn't be completely solid walls, they would have some infill used instead, which would improve their flexibility. It may work without this.