This is a simple, fast and efficient Morse key. All you need is:
1) print the file named Key_Morse_v2_arm.stl
2) print two copies of the file named Key_Morse_v2_support.stl
3) finally print the file Key_Morse_v2_base.stl.
The file named Key_Morse_v2_full_view should not be printed and only serves to demonstrate the assembly.
To complete the Key you need several Screws, nuts and washers:
5 x M3 x 10 mm screw
1 x M3 x 15 mm screw
2 x 3 mm diameter washer (used to solder contacts)
4 x M3 nut
1 x 15 mm spring.
4 x M3 x 12 mm wood screw ( used to fix two support to the base )
I used PLA to print the key.
After printing could possibly be necessary to use an iron file to clean up the key arm and adapt it to the two supports.