What are the site addresses about the big river site and the arm-and-leg site? I can search only GSS thingThe material is not there yet for 3D printing. Someone did it and the results were too heavy and too brittle. IIRC, it was @fritzhimself.
OP-Are you looking for the pre-parallel drilled versions of the 6.1 16x18? Only a few places would possibly have them (the auction sites, the big river site, the arm-and-leg site and GSS). You could try posting in the Wanted section. Good luck because it has been at least 5-6 years since the old BLX1 6.1 versions.
There are wrg710300's available, but I cannot be sure if those are for parallel drilled or not.
Sorry, I'm NewB here, did't know about policiesThe big river is the name of the big river running thru South America. The arm-n-leg site starts off the same as the name of this site and ends with the cartoon character that's always bothering Mr. Wilson. They charge $1/hole to build the grommet strips. Neither can be explicitly named due to policies here.