I designed this end cap to aesthetically match the modular filament rack design, which is octagon shaped. Interior dimension of ½" EMT is 0.622", and the plug is 0.625" for a snug fit. Exterior dimension is 1". You may need to modify plug dimensions based on how you've deburred the pipe.
Modular Filament Rack: https://www.printables.com/model/403853-filament-spool-rack-stackable-glueless
Pictured in SunLu PLA Wood.
.3mf includes print profiles for 1, 4 and 8-packs for printing convenience.
The author marked this model as their own original creation.