This one is Print in Place item - some supports are recommended. 

I used PLA with 0.15 (QUALITY),  and also I included the said supports into the attached  .gcode file.  These build in supports  can be easily remove by hand and a small cutter.

Furthermore,  you can use the .STL file  with Paint on Support option on Prusa Slicer to chose your own method of supports. 

A GAP used in this design is 0.15 mm therefore printing in low resolution is not a good idea here.

Have Fun