[Trevor78]

Have you tried any using the original Kent Moore window setting block tools?

Firebird Kent Moore 3D print door glass blocks (5) by Aus78Formula, on Flickr

Firebird Kent Moore 3D print door glass blocks (1) by Aus78Formula, on Flickr

Firebird Kent Moore 3D print door glass blocks (7) by Aus78Formula, on Flickr

For a 2nd Gen question, I'd post in the 2nd Gen forum.