Ham radio UTC clock frame

A frame that enhances the appearance of the MFJ-121B Atomic clock
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updated January 25, 2024

Description

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The MFJ-121B is a wonderful dual zone atomic clock. The only problem is that the visual design of it leaves a lot to be desired. 

Purchase the clock here: https://www.dxengineering.com/parts/mfj-121b

This clock frame friction fits onto the MFJ-121B Atomic clock to provide a more finished look for display on your shack wall.

There is a UTC label on the top right side frame of the clock to easily differentiate which time zone is which.

I have printed this in ASA. There is no need to glue the pieces together, they have a tight friction-fit. This allows the frame to be installed and removed from the clock. The three plates are optimized for Bambu Lab P1S:

  • Smooth PEI/High temp plate
  • 0.04 nozzle
  • ASA
  • 100 degree bed
  • 100% scale for frame
  • 99% scale for bowties

Print ASA with a closed chamber and adequate filtration.

Turn on the bed and let it sit at 100 degree for a while before printing to raise the temp of the chamber before printing.

No reason why this cant be printed in any other filament. I prefer ASA.

The bowties are on their own plate so that you can quickly and easily adjust the size of them to fit snugly into their holes. Simply scale the objects down as needed based on the dimensional accuracy of your prints. I had a perfect fit at 99% scale for the bowties.

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