DIY Macchina A0 Clone built from parts attainable from amazon.

Case Models:
For OBD connectors with 1.5mm flanges and the smaller KeeYee esp32 boards
Top (you may need to oversize 1% depending on material and printer calibration)
https://github.com/Switchleg1/AMAleg/blob/main/SL1.3.5-top.STL
Bottom (x2)
https://github.com/Switchleg1/AMAleg/blob/main/SL1.3.5-bottom_half.STL

For OBD connectors with 1.5mm flanges and the larger esp32 boards with mounting holes
Top (you may need to oversize 1% depending on material and printer calibration)
https://github.com/Switchleg1/AMAleg/blob/main/SL1.5-top.STL
Bottom (x2)
https://github.com/Switchleg1/AMAleg/blob/main/SL1.5-bottom_half.STL

For OBD connectors with 2mm flanges (not common)
Top
https://github.com/Switchleg1/AMAleg/blob/main/top.STL
Bottom (x2)
https://github.com/Switchleg1/AMAleg/blob/main/bottom_half.STL

Parts list (quantity 1 of each):
Any ESP32 dev board
https://www.amazon.ca/KeeYees-Development-Bluetooth-Microcontroller-ESP-WROOM-32/dp/B07PP1R8YK/ref=sr_1_20?crid=22P4LA1F8VBNC&keywords=esp32&qid=1643595911&sprefix=esp32%2Caps%2C105&sr=8-20

SN65HVD230 breakout board - **Watch out for fakes, take note of how long they have been selling for and if they are less than $3usd each it is probably fake, if the last line of the chip reads 'ctcv04' it is a fake (though there are more fakes these have been tested).
It appears all of the square boards are probably fakes at the moment and the only luck we have seen are with the rectangle board. **
https://www.amazon.ca/SN65HVD230-CAN-Board-Communication-Development/dp/B00KM6XMXO/ref=sr_1_5?keywords=waveshare+sn65hvd230&qid=1651667489&sprefix=sn65%2Caps%2C108&sr=8-5

Any MP1584 based buck converter
https://www.amazon.ca/eBoot-MP1584EN-Converter-Adjustable-Module/dp/B01MQGMOKI/ref=sr_1_9?crid=192T7TLTFMKHE&keywords=buck+converter&qid=1643596906&sprefix=buck+converter%2Caps%2C105&sr=8-9

OBD2 connector (can also be taken from an elm adapter)
https://www.sparkfun.com/products/9911

Schottky or fast recovery diode (1Amp 20v) 1N5819, SR100, UF4004, etc
https://www.amazon.ca/1N5819-Schottky-Barrier-Rectifier-DO-204AL/dp/B07RL3SCL4/ref=mp_s_a_1_5?crid=AX2MPSXQXPUM&keywords=1+amp+schottky+diode&qid=1643646733&sprefix=1amp+schottky+diode%2Caps%2C267&sr=8-5

Wire diagram:

After assembling remember to set the voltage regulator anywhere from 5-5.5v (turn knob clockwise by 1/10th of a turn) and flash the latest firmware https://github.com/Switchleg1/esp32-isotp-ble-bridge

Print layout:
Always print with logo facing up with support material. If printing with ABS i recommend a peelable raft.