Quantity   Component name
1 × RaspBerry Pi 3B + Runs OctoPrint, Tensorflow and boots the PiZero
1 × RaspBerry Pi Zero Runs MjpegStreamer for the camera. You can't run MjpegStreamer, OctoPrint and Tensorflow while printing
1 × 32 GB sdcard Reccomended size this is for the Pi3B+, PiZero boots from Pi3B+ and does not need storage
1 × Official Pi camera, either version The older camera is cheap ($7) and works as good as any. Helps to standardize for the mount.
1 × Pi camera cable for Pi Zero SHort one is fine
1 × Good power supply for the Pi3B+ Pi zero powered from Pi3B+
1 × Nice long micro USB cable PiZero mounts on printhead, cable goes to Pi3B+