This is a model of a No Solicitation sign to attempt to get rid of some of those scam artists door salesman.  I made this sign without holes so it could be glued in place or simply run a stainless steel screw with a washer into the locations you want to mount it.  Used red and black to make it stand out so they could not miss it.  The original stl file is 9”x9” which ends up coming in as mm so the large size is 2000 scale (7-1/16”) and the smaller is 1200 scale (4-1/4”).  These scales served my purposes to place on near the ring and one on the first wall location as they approach the house.  These signs are working well for us since door to door people come trying to sell things or try and test for theft target houses. 

Feel free and modify this as you wish.  Also there are many places selling stickers and other signs out there.  This was more to create one for our needs and peace of mind. The exclamation point looks a bit like a small L, but still can be seen and did cause one person to take a closer look and then look to see we do have cameras.  Hope this helps or make your own.  Happy printing.