Here are a bunch of tutorials for manufacturing small to medium scale (10 - 10,000) piece surface mount electronics.
SMT Process Explained Custom Manufacturing & Engineering, Inc.™ - Custom Manufacturing & Engineering Inc.
SMT (Surface Mount Technology) Manufacturing Process - Insight Solutions Global
China Semi-auto Stencil Printer Machine Smt Printing Machine
SMT Production Line ZB3040H Smt Stencil Machine 250x400mm Manual High Precision Pcb Stencil Printer Solder Paste Printer - AliExpress
China Semi-Automatic Stencil Pinter Machine in SMT Production Line Suppliers & Manufacturers - Factory Direct Price - ETON
PCB Printing Machine SMT Solder Paste Stencil Printer YX32125 SMT Production Line - AliExpress
LPKF Edition SMT ProtoPrint S4 SMT Stencil Printer
What is SMT stencil? How to do PCB printing?
Neoden pick and place SMT Solder Paste Stencil Machine supplier and manufacturer
China Semi-Automatic Stencil Pinter Machine in SMT Production Line Suppliers & Manufacturers - Factory Direct Price - ETON
I.C.T-4034 Fully Automatic SMT Stencil Printer from China manufacturer - I.C.T SMT Machine
SMD Stencils Sierra Circuits