Smoothing my 3D print pla for Iron Man project

This is my current process for getting nice smooth prints using sanding and fine filler for smoothing the pla.
I am no expert but this is working well for me and doesn't take loads of time.

Hope this helps
Links for the rest of the project...
Box and Loop files
https://www.youtube.com/watch?v=9uIXtODioGM

Screw kit
https://www.amazon.co.uk/gp/product/B07GP3CM8M

Servos
https://www.amazon.co.uk/gp/product/B07WVC3RRN

Battery pack
https://www.amazon.co.uk/gp/product/B077P186ZN

Bearings
https://www.amazon.co.uk/gp/product/B08FMR1YBC

Arduino
https://www.amazon.co.uk/gp/product/B072BMYZ18

Servo horn screws
https://www.amazon.co.uk/gp/product/B07SGP8TWS

LED arduino tutorial
https://www.youtube.com/watch?v=WXZoxG799Nc

Видео Smoothing my 3D print pla for Iron Man project канала Printing Iron