Prerequisites: This re-uses the metal mounting brackets off the original radio (see photos). They are riveted to the original radio, and the rivets can be drilled out or filed away, so they can be removed and reused. 4x short self-tapping screws are also required; they must be short enough to not interfere with the screen when mounted. The head unit itself will need to be wired in either manually or with a harness kit. I highly recommend the Enfig harness made for these cars, which works perfectly with the original Bose sound system, and can supply steering wheel control signals to the head unit.
Materials: I highly recommend ABS or ASA for this application. Bambu black ABS is a very good match for the other interior panels. I have had this installed in my personal car for over a year (printed in Bambu ABS) through -15*C and +40*C outside temps with no issues. Other materials may also be suitable depending on your specific conditions. I used clear polycarbonate for the USB light filters, but clear ABS or PETG may also be suitable.
Chamber Heater: If using ABS or ASA, I would consider a chamber heater a requirement for this, as the object is large and flat, and will be prone to warping. I was able to achieve a nearly warp-free print (as seen in photos) using a Bambu P1S with added chamber heater.
Other recommended settings are in the provided .3mf file, however, this is not a part that sees considerable stress, so a wide range of settings should result in a usable part, with the only exception being that the screw holes need to be strong enough to hold without affecting layers.
Assembly: Assembly is relatively straightforward. Two screws on each side hold the side brackets to the main piece, and the metal mounting brackets from the original radio slip into place onto the printed side brackets. Once the metal brackets are slipped into place, it is best to melt the excess plastic over them (as shown in photo) so that they stay in place more easily during install, though this is not strictly necessary. I recommend attaching the screen to the unit first (which may need to be relocated until the screen and unit match up with the opening and the screw holes), then tightening the mounting screws with the screen pressed firmly into place, then removing the screen first before installing the unit into the vehicle.
To install the vehicle, take care to align the rails on the side brackets with the openings in the dash, just like with the factory radio. This will insure that the unit is aligned properly. Once everything is lined up and plugged in, it should slide fully in and click firmly into place. Finally, the screen can be plugged in and pressed into place, completing the install.
There are two small pockets at the top of the screen opening that are present to allow an angled pick to be used to remove the screen, and thus allow the unit to be removed from the vehicle (see photo). After the screen is removed, the metal mounting tabs can be pulled inwards also with a pick, to be able to remove the rest of the unit and mounting plate.
Enoy!