Thought somebody might be interested. I found some glues that seem to work really well (and are really strong) for gluing PETG to other materials and PETG to itself. I have been gluing PETG to steel. For a thin liquid crazy-glue-fast setting: Loctite 435 Loctite SF770 activator-You need to use this for PETG because it is a low-energy plastic. You don't need much of this stuff. A small bottle will last forever MCD Industrial has this. For epoxy fans, I use JB Weld Plastic Bonder. You have to hold the parts together for about 30 minutes before it sets up. I get it at Home Depot. To mix the epoxy, I use a Q-tip with one end cut off and use an old piece of scrap paper to mix it on. Q-tips are cheap, especially at the big box stores. I only print PETG now. Most of the parts I print have a functional use and PETG is strong and easy to print. I use PETG from Microcenter. Inexpensive and seems decent.