Based on multiple regular and X-Lock disks, most of them should fit just fine. To be sure I added an additional 2mm tolerance to the 125mm spacing.

Gridfinity

Dimensions: 

• 3x3x6U
• 3x3x9U

Remix

The model was made with OnShape and should be available to all [https://cad.onshape.com/documents/d2b1533fdd4339235a0aeaef/w/dfd6302d8036a7602175fc06/e/4eada7cc2ac3b44c43933082](https://cad.onshape.com/documents/d2b1533fdd4339235a0aeaef/w/dfd6302d8036a7602175fc06/e/4eada7cc2ac3b44c43933082)

For some reason the viewer resets the Gridfinity settings so don't forget to set these (in the left top above the steps/features) to:
slotsDeep: 3
slotsWide: 3
slotHeight: 1

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2025-11-25: Added 9U high version