This video from oorail shows the 3D printing process from loading the 3D object file in Cura, checking the print settings, printing and removing the print from the 3D printer. This video shows the full length time of 3D printing a scale 10m long model railway accessory. You can skip the 3D printing part by jumping ahead to around 31:30 after the first few minutes of the video. This video was requested by several people who wanted to see the 3D printing process, its pretty easy.

You can find the printer here:

You can find a test print (BR Double Arrow) here:

The 3D item printed in this video is available from Trackside3D: