can't make parameterized blueprint for welder. also tried hooking up the welder to a requester chest using wires and it doesn't work as well 'cause you can't connect wires to a welder. I'm not sure what other machines can't be used for parameterized blueprints but I thought you might want to look into that
thank you for the report - i'll look into it, but i have absolutely 0 idea why they cant be linked up; once i figure it out it'll either be included in the next major update, or a patch (whatever happens first :] )