The Dispenser fits 35-40 Blades. To insert the spring, tilt one of the inner plate's corners into one of the back corners.
I basically modified the model to eliminate the need for screws and adapted it to a 19mm x 6.4mm (inner) spring.
Francesco Gagliardi "Safety razor blade dispenser with spring": https://www.printables.com/model/374135-safety-razor-blade-dispenser-with-spring
The author marked this model as their own original creation.