here is my version of Gridfinity stuff for stuffing stuff inspired by ZackFreedman https://thangs.com/designer/ZackFreedman the creator of the Gridfinity System that we all love.
Find more Gridfinity accessories at https://bit.ly/3E2NxnZ
this model is fully parametric, you can find the customizable Fusion file in the download all attachment, if you can't use Fusion feel free to ask for custom dimensions in the comments and i will upload you a stl.
I've also upload a round and elliptical version of this model: https://social.thangs.com/m/629878
the model supports both squares and rectangular holder and it is possible to configure 4 indents in the holder to facilitate the grubbing of small items, all is done in the change parameter window in Fusion
waiting to see pictures of your versions uploaded here. happy printing