Yes, printing with SpotMyPhotos requires the use of two apps:
The SpotMyPhotos Printer App, which pulls requested photos down from the SpotMyPhotos cloud.
The Print Manufacturer's own Hot Folder Application or Print Utility Application, which instructs the printer to print every photo placed in a designated hot folder. This second application is not a SpotMyPhotos app, despite similar terminology.
More detailed guidance can be found in this Printer Setup Article.