Now, this is just silly: this is a remix of a remix of a remix of the original design by Mikolas. Click the links to learn about who added what. 

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There are three known versions of the Harley Benton Thomann hardware:

• 5-screw hardware used in the original design from Thomann in Europe
• 3-screw hardware from Thomann in Europe
• 3-screw hardware from Thomann in the US

This design has provisions for M4 threaded insert for the 3-screw variants. The 5-screw design was too tight for a threaded insert and it's also strong enough to not need it at all. 

I use this CNC Kitchen's threaded inserts kit from Amazon. 

Printing

Print using the same settings as the original Prusacaster. 

I suggest before going all in, print the first layer of each model to check which bridge variant you ended up with. 

 Best of luck printing your version!