Sterilite 3 Drawer Container Clips

My daughter moved back into school and needed some additional storage space under her lofted dorm room bed. These 3 drawer containers ( https://www.walmart.com/ip/Sterilite-3-Drawer-Cart-White/3385116?classType=VARIANT&athbdg=L1102&from=/search) are popular at school and these clips allow two of them to be clipped together, back-to-back to roll in and out of closets or under lofted beds.

These were printed in PLA at 50% infill but could probably be done at 25% just as well. They are really tight once clipped together.