This is a simple design for wall mounting a 200mm silicon wafer. 

Q: What is a silicon wafer anyway…???   They are used to create integrated circuits, but some are defective or not used and sold via surplus outlets.

Q: Why would someone want hang one on a wall?  I have no idea.

Q: Cool… where can I get one?  Probably several places, but Electronic Goldmine has (2) for $6 right now…  https://www.goldmine-elec-products.com/prodinfo.asp?number=G24595A

Note that the base piece needs to be printed with supports, which turn out to be a pain to remove. Getting them cleaned out good is essential to get the hanger piece to plug in properly.  Blunt force trauma applied to the parts may be beneficial.

OpenSCAD source is included.  Enjoy!