These are 1x2 gridfinity modules. Their function is to be an angled baseplate. They are low, but they will still raise up any module on them as well as angling them forward. There are versions with angles in 5º increments up to 20º. This lets gravity collect things on one side of a module, or makes it easier to look inside, or access tools, etc.
If you reslice these, I recommend:
This is one of three angle baseplate models. The other two are:
Based on the Gridfinity System from Zack Freedman: https://thangs.com/designer/ZackFreedman
https://www.youtube.com/c/ZackFreedman
License: CC BY-NC-SA 4.0 https://creativecommons.org/licenses/by-nc-sa/4.0/
#gridfinity
The author marked this model as their own original creation.