Advice needed on 3D printing patented designs

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Illustrative scenario prepared by my practice.
For informational purposes only. This is not legal advice. Laws vary by jurisdiction. Consult a qualified attorney for advice specific to your situation.
Hypothetical question

I'm dealing with a situation and need some guidance.

3D printing patented designs. I've been dealing with this for about 3 months now and the situation isn't improving.

This involves original creative work over the past 36 months. I do not have documentation proving my ownership and timeline.

What are my legal options here? Is it worth pursuing?