Many plastic injection mold makers can attempt to make your mold but any small error makes the mold useless and impossible to fix. Also, injection mold shrinkage can be different on the various part axis (x,y,z) and can make the part not function properly. You have two choices:
1) go with an experienced gear design molder who may even tell you your project is too high tolerance for success or make you aware that you can succeed but only with expensive tooling and exacting production control..
OR
2) you can work with lower cost inexperienced plastic injection mold makers and have a project with all kinds of problems and final failure. I have done both, even a simple polycarbonate ring gear we made, had a host of production problems before we got it right.
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