This adapter is designed to fit the standard Apple II series DB-19 disk drive connector and an IDC20 floppy drive cable. It was designed to work with the Apple II FujiNet but could be used with other devices.
The +12V and -12V lines are disconnected by default but can be enabled with the 2 solder jumpers on board. Just apply a blob of solder on the pads to create the connection. The Drive 2 signal from the DB-19 side is broke out to a pad on board. The DB-19M connector is 3D printed in PLA.
Before using this with a device other than FujiNet, please verify the pinout of the device and compare it with the schematic provided.