I got sick of my cutting boards falling over in the kitchen when I bumped anything in their vicinity, so I threw this basic stand together to keep them together and upright. I have a lot of boards so this holds up to 8, each gap is 8mm so if what you're holding is less than that it should work.

I printed this slightly hotter than normal to try and improve the layer adhesion since I thought if they tried to fall over they could snap the fins if the layers weren't bonded well, and so far so good (although the extra heat caused a bit more stringing as you can tell by the photos). Mine is printed in PLA, at 0.3mm layer height and with 5 walls and solid infill to improve strength.