You need to keep the original thermometer and the 2 small white cube that holds it. No glue required. Snaps really good and the lid is easy to remove by prying the slot. You may need to use sand or rocks to make it heavier otherwise it might float if there is a little bit of air in the print, that why I use 100% infill. The fit was tuned for ASA, but PETG would probably work too with a little bit of tuning.