The 1911 is, in all its copied variants, one of the most successful pistol designs and is most popular in the United States.
Blueprints and cad models exist for the 1911 aplenty. If a 3d printed 1911 frame was viable someone would have probably done it by now. Currently the only known 3d printed project that uses 1911 parts is the 3011, which is basically an AR receiver with a 1911 slide where the upper should be.
https://odysee.com/@TheGatalog-TechnicalDataPackages:c/Colt1911Blueprints18pages:b
https://odysee.com/@TheGatalog-TechnicalDataPackages:c/1911A1:8