Jon 
Skullvalanche@revivalrecords I do not have any such file, but this is relevant to my interests so hoping someone responds here. 😅
@revivalrecords This looks interesting, but seems like it would limit the amount of vinyl one could put in a given cube.
https://www.printables.com/model/678158-vinyl-record-holder-for-ikea-kallax
@revivalrecords OK now I am down the rabbit hole and I managed to find this?
https://makerworld.com/en/models/994674-kallax-vinyl-alignment#profileId-1058008
Kallax Vinyl Alignment - Free 3D Print Model - MakerWorld
Download this free 3D print file designed by ALonelyRider. This is a vinyl record backstop for the Ikea Kallax Shelf system. This design was inspired by the design below and then beefing it up some for durability and extending the backstop so the records are closer to the front of the shelf. https://makerworld.com/en/models/947623?from=search#profileId-914743 This will help make your vinyl collection line up nicely with the front of the Kallax shelf for a clean, organized look.
@skullvalanche Oooh. They look pretty good. I’d prefer not to have to pull the units out to screw them in the back but that’s just me being fussy. I think these will do nicely! Thanks for looking!
Kaiser 
📷 🎞️ 💿 
@revivalrecords Thingiverse has a few options of varying complexity: