If you want customer plastic parts made cheap, getting them made in china might be an option worth considering.
Like everyone else they will need drawings, though. 2D and 3D is best. A BOM can help a lot too.
However, you can get someone to inspect a factory for you to make sure they are capable and most are willing to sign an NDA if required – if one won’t another one will.
When working with a Chinese factory you should always try to maintain a good working relationship. Many factories will try to help you more than a lot of others. Some will even suggest additional places to sell your product. They want to make as many of your products as possible.
Another thing you need to consider if choosing to manufacture in China is the shipping costs. If the part is large or bulky then the costs of shipping will go up.
Finally, take a look at this article I wrote on ezines.com: http://ezinearticles.com/?Inventions---Combining-Your-Business-Plan-Development-With-Your-Product-Development-to-Minimize-Risk&id=2225283
. It gives some good ideas on how to combine funding with development so that you don’t need to spend too much of your own money.
Good luck with it all. Let me know how you go.
SarahDocumentation and Quality Control Engineerhttp://www.getyourstuffmadeinchina.com