Here are a bunch of tutorials for manufacturing small to medium scale (10 - 10,000) piece surface mount electronics.
Cheap NeoDen SMT Manual Stencil Printer SMT PCB Printer SMT Screen Printer Machine for LED SMD FP2636 Support Framed Stencil - AliExpress
Laser Cut Solder Stencil - BlueRing Stencils
PCB Stencil Guide From Basic Concepts to Design Details-FS PCBA
736X736mm SMT Frame for SMT Stencil in PCB Assembly Production Line - China Stencil Frame, Pneumatic Frame
What Does a Solder Paste Stencil Do in SMT?
What is PCB stencil
NeoDen SMT Stencil Printer Solder Printer for SMT Production Line PCB SMD Manual Solder Paste Printer FP2636 Frameless Version
How to use Full-auto SMT Stencil Printer correctly?
Understanding SMT Stencils: The Backbone of Electronics Manufacturing – ABP Electronics
SMT Stencils – Agile Circuit: PCB Manufacturing & Assembly Service Supplier in China
736X736 Framed SMT Stencil manufacturer from China
Best Price Hot Sell Quick Alpha SMT Stencil Makinesi Mounting SMT Stencil Frame - China SMT Screen Printing Frame, Screen Frames
What are Stencils and How to Use them?
What is PCB Stencil ? - RAYPCB