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:
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!
The author remixed this model.