This is a sample holder we use for zero background wafers for our Bruker D2 machine. The wafer size may differ, you have to adjust the FreeCAD-File for that.
We machined the parts from Steel, but you can print them as well. I have not printed these files, be careful.

I take no responsibility for your usage of these files. Please check your printed parts for compatibility. Use only original parts on your machine if you want to be safe.
Created originally by our mechanical departement, recreated as FreeCAD file by me.