These card guides were created for my S-100 diagnostic system and are designed to be used with the s100computers.com 9 slot backplane.
The models should be printed flat with no support. 15% infill should be sufficient.
[Update 05Feb24]
I added the Fusion 360 file for the part - the design is horrific, but is at least mostly parametric. It should be marked with a sign that reads, “Abandon hope, all ye who edit this file.” ;)
The author marked this model as their own original creation.