First - thank you TimATX for creating the original model.
Threaded 6" pass through by TimATX | Download free STL model | Printables.com

I needed a smaller version to create a sealable air hole/port in the top of my Sovol SH01 filament dryer.  I scaled it and cut the height of both pieces to make it fit correctly.  This is a bit more challenging than simple scaling as I had to adjust the cap after scaling to make the threads work properly.  I then reduced the height of the assembly to prevent them from hitting the top of the spools sitting inside the SH01.   I crudely did the modifications in Bambu Slicer as I am unfamiliar with 3d CAD software.   

Notes:

• The inside diameter is about 1.2 inches.
• This will fit perfectly into a 1.625" size hole.  
• The “back-up” ring was omitted from original design.
• Printed on Bambu Labs X1C using Overture PLA
  • .16mm layer
  • 15% infill
• The cap proved difficult to print and is somewhat rough.  I printed it cap down (threads up) with tree/hybrid supports.  YMMV.