Hello my fellow iEngrave crafters! I know a lot of people had asked about engraving larger tumblers so I tried it out. My tumbler engraving journey started with what would have been a simple tumbler but I made a mistake the image I used has a white backing and I wanted to see if it was doing a solid image on the engraving and moved the tumbler when checking messing up the design even more 
You can see the line from me moving the tumbler. From this i learned how to make sure this did not happen again. I made sure to remove the backing and also made sure I welded the image to make sure it was just what I wanted. Then had words placement how I wanted and welded the full design. Measure your tumbler so you know the area and size you are putting the design in! I recommend making it a little smaller then area you want design in. Now I tried a handle tumbler this did not work even with having it for minimum movements when engraving. I even made the mistake of moving the tumbler holder so it was vertical this resulting in just a line being engraved. The tumbler holder needs to be parallel to the bar holding your laser. Even with handle tabs bent down I could not get a good engraving because it had movements when it would hit the tabs causing an uneven design. I did get a 30 Oz non handle tumbler engraved on. When roaming the tumbler there was extra movements because it’s not strait so I had the end of it on the end of the tumbler holder. It worked out just took some moving it in the right spot and making sure it would be engraved in the area I wanted.
It turned out AWSOME! I think I will stick to more of a strait tumbler and not drive my anxiety crazy in the future.
I do not recommend using tumblers with handle tabs using the tumbler attachment for safety and your own frustration. The one I did a friend made with me for herself and didn’t take a photo I asked her to send me one that I can add if and when she does.
I’m excited to see what you’ll make next with the IEngrave 