Compact model with very thin 1.6mm walls. Prusa slicer project files included with all necessary settings - take a look at the support and seam configuration for base model before printing from stl.

Print parameters:

• print in STRUCTURAL mode
• 4 outlines required for the base model, layer height 0.2, support required
• min 3 outlines that form the wall of a model for cap (layer height 0.15 ) and spacer (layer height 0.2)
• material - PETG

Additional items: 

• M3x16mm or longer screw to strengthen the threaded connection
• M3 nut should be with nylon to prevent loosening

Postprocessing:

• use a long M3 screw or thin tweezers to place the nut in place
• the internal thread of the cap should be cleaned with an M10 threader or steel screw to make it run smoothly