If you have a precision printer, you don't need to glue the part, it's better if some spills on the tray can lead to liquid dripping into small gaps.(Tip: For the best fit, use a small layer height and use a large Inffil of up to 80% to prevent warping or deforming from hot cups)

If you accidentally spill, you can always remove the parts by using both thumbs on the corners and a gentle twist, they will pop them out.

If you have any suggestions please let me know, and I will be happy to see your makes and comments.

Happy printing :)