I rebuilt my kallax shelf and wanted to put my drawers and doors back in but realized I didn't have the spacer. I tried to see if anyone had a .stl that I could print quickly but weirdly no one did. I emailed IKEA and they mailed me the piece through their free parts service but it took a few weeks so here it is modelled so it can be printed in a few min!
The author marked this model as their own original creation.