Bert_bottom_KO_supported

Inserted knock out plugs for unused ports (DC, switches, & ext. battery) because I only use USB jack to power the Morse tutor, which saves parts cost especially with big batch club assembly purchases.
Also put bit of self supporting in the other side holes to avoid slicer implemented supports that are sometimes desirable but always too much, probably only because of my newbieness to 3d printing.
Remixed from https://www.thingiverse.com/thing:5377530, thank you Mr. Hall.
This object was made in Tinkercad. Edit it online https://www.tinkercad.com/things/0BmU7amaSQj