DIY Knobster Case

A DIY version of the Air Manager Knobster with the same footprint/fixings as the retail version.
See https://www.siminnovations.com/buy/product/57-knobster for more information.

Update.

After a report that version 5 of air manager did not support the Pro Micro (neither did version 4, officially), I created a new case for the officially supported Arduni Nano (type C connector). I have added it to the stls listed here. External dimensions are still the same.

On further testing, it looks like the Pro Micro does still work with Air Manager 5. The key is to add the Knobster to the panel to make it available to all the instruments on that panel. Also, to program the Pro Micro, use Air Manager to flash the Knobster as an Arduino Micro device. Once finished, delete the device created, and add a Knobster device, making sure to un-tick the flash checkbox. Finally, add the knobster to the panel.

Slightly different base designs are supplied for three variants of the Arduino Pro.

A new base, encoder mount, and case has been included to allow the use of the (Siminnovations supported) Arduino Nano. There are two versions of this: the first having the same dimensions as the others (and the non-DIY version), and the second being 2mm taller to make more room inside for wire routing and 0.8mm wider to make the sides a bit more sturdy.

The knobster can also be programmed to work with Mobiflight, and a sample configuration is supplied.

Additional parts required:

Dual Rotary Encoder EC11EBB24C03.
Arduino Pro Micro as pictured (include USB-C and USB-C offset).
30AWG silicon connection wire.
Heat shrink tubing to suit the wire.
Double sided adhesive foam / sticky pad. 
Appropriate glue to affix the encoder mount and the base.
4 x M3 Bolts for mounting.

Printing: 

2 Perimeters. 5 top and 4 bottom layers. 15% infill.
Supports are required for the Cover only.

Prototypes were printed in both ABS+ and PETG.
Tolerances are quite tight, and so require a reasonably well set up printer.

Construction:

1. Cut 6-8 wires to approximately 50mm in length. Use thin wire (30awg or less).
2. Wire up the encoder to the Arduino Micro as per the diagram. The encoder ground connections (black wires) on the prototype were wired individually to the three GND pins on the Arduino. Use heat shrink tubing on the encoder connections to ensure the pins cannot touch each other after installation. Alternatively, cut the legs short before soldering the wires on.
3. Fit the rotary encoder into the encoder mount and bend the mounting tabs to secure in place.
4. Apply a small amount of glue to the sides and top of the encoder mount (making sure not to get glue on the encoder's moving parts) and offer the assembly up inside the cover. Push the mount flush against the top inside of the cover.
5. Apply a sticky pad to the bottom of the Arduino Micro and press into the base, ensuring the USB connector is facing outward and resting on the connector support.
6. Plug a USB cable between the unit and your computer. Check the unit is operational before moving on to the next step.
7. Apply a small amount of glue to the bottom of the cover and bring the cover and base together.
8. Finally, fit the outer and inner knobs to the encoder, making sure to align the notches inside the knobs to the notches on the appropriate encoder shafts.