Ask HN: Startup 3D printer or China for manufacturing?

I need to produce PVC like pipes with some holes and engravings. 17-40 inch long. I need to make 300 of these.

Acrylic will be the material.

Should we invest in 3D printer or go china for producing this for startup?

Later, we'll need 5000-6000 of these every month.

Or should we be investing in some different kind of manufacturing?