This was a prototype RFID reader and writer module for a DC tool controller. It also converts TTL to RS232C. However you can use if for any Arduino project that uses the Ladyada RFID shield for the Arduino UNO. it has mounts that allow mounting on walls etc. You can modify it for any purpose such as RFID door access.
I included Fusion360, as well as STEP so you can modify it for your particular application. All hardware and components are listed in the exploded iso in the images.
Link to ladyada PN532 RFID shield:
Wanhao i3 (Monoprice Maker Select)
Settings/material can be anything you like, I used Innofil3D PRO1 filament for the final prototype because of the testing environment. The conditions required durable material, but depending on your application PLA or ABS should work fine.