Finding a manufacturer
The best-known board game manufacturers are found the same way most publishers found them: through other publishers. Crowdfunding pages often credit the manufacturer, publisher communities openly discuss who they use, and designer forums maintain running threads of experiences good and bad. Names like Panda, Longpack, Whatz, and HeroTime come up constantly for China, alongside domestic printers and European houses like Ludo Fact. Start from recommendations, not search engines, because anyone can build a polished website.
Vet a manufacturer on three axes. Track record: ask which published games they made, then look those games up and even buy one to inspect. Communication: your first few emails tell you a lot, since a factory that answers slowly or vaguely during the sales process will not improve once they have your deposit. Fit: some factories specialize in miniatures, others in card games, others in high-volume mass market work, and a factory whose sweet spot matches your game will give you better pricing and fewer problems.
Be aware of brokers. Some companies that look like manufacturers are actually middlemen who place your order with factories you never see. Brokers are not automatically bad, a good one manages quality and communication for you, but you should know which kind of company you are dealing with and what the markup buys you.
When you make contact, have your specs ready: component list, quantities you are considering, and target timeline. Serious factories will respond with questions and a quote. If you can, meet manufacturers in person at conventions like Essen Spiel or GAMA Expo, where most of the major ones have booths and you can handle sample components directly.
Try this now
Make a comparison table with three columns: the decision, the cost risk, and the question you need answered before committing.
Video tutorials
Finding the right mixture of luck and skill with Richard Garfield
How to design games that stand the test of time with Brad Talton