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Text and logos follow the same rules as small features do. If your text and/or logo is a important part of the prototype please let your project manager know. The reason is that some times th best orientation for the part to grow is not the best for the logo. When possible keep spacing between letter around .020" and try to use common fonts such as "arial" "tahoma" or "verdana" beacuse these are design to print clearly even at smaller sizes.