A friend gave my kids a big box of erector set pieces recently, along with instructions on how to build the models. Only problem was that a bunch of pieces were missing. I downloaded a few of the files from here, but I don't think they were designed for this set.

These are ones that were missing in our set that I had made. Tested them out and they match the correct patterns.

I usually print all walls, skirt not brim, no supports. You can print them in their default position and they work fine.

Enjoy!