Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5691227.

The payload adapter is connected to the avionics bay using two 2M nylon screws and nuts. The adapter provides a pathway for the sensor wiring from the avionics bay to the conduit connection. The top of the conduit fairing has been incorporated into the adapter design. The adapter has an opening to hold the DuPont connectors in line with the conduit. A three slot connector is located along the base of the opening, while a 2-slot connector is centered above. The inside of the adapter is hollow to allow for easy movement of the wiring.

The payload adapter and the conduit supports were designed in Tinkercad. The attachment ring of the adapter is copied from the attachment ring of the avionics bay. This ring is included as a separate drawing in Tinkercad to allow you to create your own payload modules and connect them to the avionics bay.

Like the avionics bay, the adapter, the conduit supports, conduit end cap and conduit connection were all printed on an Ender 3 V2 printer. I used 1.75mm silver PLA filament from Hatchbox for the adapter and end cap. The conduit supports (a total of four are needed) as well as the conduit connection used the orange 1.75mm PLA filament. All were printed at a 0.2mm quality setting with a 15% infill. Total printing time for the adapter was about 4 hours as well.

The adapter was printed without any supports. This resulted in some loose filament on the inside of the adapter. This area was brushed with Plast-I-Weld plastic fusing adhesive (https://flex-i-file.com/products/7112-plast-i-weld). It works by slightly melting both sides of the plastic and merging them together, forming a strong bond.

A complete project manual is currently under development. Until that manual is completed we recommend that you review our Instructables article for more detailed information about this project. It can be found at https://www.instructables.com/Project-Icarus-a-Temperature-Sensor-Model-Rocket/

Tinkercad Payload Adapter and Conduit Files:https://www.tinkercad.com/things/hx9JfLnzzFe

Tinkercad AstroCam Housing Files: https://www.tinkercad.com/things/5XbiHjYzAvv

SourceForge Arduino Files: https://sourceforge.net/projects/project-icarus