Just to be clear about this, as far as this site (Dakka) is concerned, 3D printing of IP owned by a company falls into the same category as recasting of models, our stance on which is covered
here.
If you are asking (and getting responses)
only for 3D printed public domain works that just happen to be compatible with
40K models, then its fine for this thread to remain open.
However, the second this conversation starts veering towards recommendations of where/how to print actual IP owned by another company, then this thread will be immediately locked.