Screw-top tube (vase mode)

This project can also serve as a demonstration for simple object manipulation
directly in the slicer.

Slicer / print settings:

• "Vase mode" is required for printing this model.
• Slow down the print to get smooth surfaces. Setting the minimal layer time to 8 seconds gives good results with PETG (print speed will be around 10mm/s).
• To get a more airtight bottom, set the bottom surface pattern to "concentric". Use "monotonic" for the rest of the infill for better stability/adhesion. You may also want to increase the bottom flow ratio a bit.
• If the threads are too tight or scratchy, make sure to cut away any dents and stringing that may reside in the cap's threads.
   
• Extrusion width:
  This model is designed for 0.5mm wall width.
  When using different widths, make sure that the cap is 2*wall_width wider than the tube.
   
• Layer height:
  Use 0.1mm layer height for the Threads.
  When using different heights, use the zoom function to ensure there are no gaps in the threads.
  The body can be printed with bigger layer heights (e.g. using adaptive layer height). Bigger layer heights give better transparency, the samples use 0.32mm.

Resizing:
Different diamters are possible to a certain degree by increasing the x/y scale of the tube and the cap.
Increasing the height can be achieved by adding cylinders below the tube and the cap. Use 21mm cylinder diameter for the cap and 20mm for the tube. E.g. to get a 50mm cap, put a 36mm cylinder below it (the cap is 14mm in height).
Reducing the height of the tube is possible by just positioning it lower in the slicer. The bottom part which extends through the build plate will be cut, but still gets a solid bottom (vase mode should ensure that).

Example for 21700 battery cases:
- Scale cap and tube to 120% in X and Y direction
- Put a 25.2mm*25.2mm cylinder below the cap, set its height to 14mm
- Put a 24mm*24mm cylinder below the tube, set its height to 35mm

Example for 18650 battery cases:
- Scale cap and tube to 105% in X and Y direction
- Put a 22mm*22mm cylinder below the cap, set its height to 14mm
- Put a 21mm*21mm cylinder below the tube, set its height to 30mm

Example for 18350 battery cases:
- Scale cap and tube to 105% in X and Y direction
- Put a 22mm*22mm cylinder below the cap, set its height to 14mm
- Put a 21mm*21mm cylinder below the tube, set its height to 0.1mm

The STL files for the above cells have been created in the slicer that way.