This tree has been printed with PETG and PLA without issue.  The tree body and lid itself does need any supports.  

• The lid may benefit from a brim if it breaks loos from the bed.
• The star will need supports.  I printed it in a few directions, I found the direction I have it was the easiest way to print the star.

Once all the pieces are printed out, just slide the star in the hole of the lid and the lid fits right on top of the tree.

Print Settings

• Layer Height – 0.2mm (or 0.4mm with an .8mm nozzle)
• PETG or PLA
• Infill — 15% 
• Perimeters – 3
• Top Fill Pattern – Rectangular
• Bottom Fill Pattern – Rectangular