These cheap ($20AUD) ESP32-WROVER CAM Board's make a great little standalone wireless streaming webcam module, that can be easily attached to any printer.

Specific board: https://www.amazon.com.au/dp/B09BC5CNHM?psc=1&ref=ppx_yo2ov_dt_b_product_details 

Software setup and detailed instructions can be found here: https://freenove.com/fnk0060/ 

This video is also very informative https://www.youtube.com/watch?v=g1J_7lx5QEU&list=LL&index=6&t=547s - (It's for a different board and the WROVER can be directly programmed from the included USB port).

Note: This ESP32 board size is slightly larger than other similar boards due to bluetooth support. (See images attached)

Has three thread insert points on rear to allow for various mount options.

Example Voron V0 door hanger (does need hat removal or small gap at top of door.