Ubuntu – execute shell script without entering password

I want to execute a script that requires root privileges without entering a password. There are similar questions/answers but non seems to work for me.

I placed my script in /home/kf/bin (I added the bin dir myself) and included this directory in my path so I can run it from everywhere.

The script: trim.sh:

#! /bin/sh
sudo fstrim -v /

I changed the ownership of the script to root:

 sudo chown root:root /home/kf/bin/trim.sh

and made it executable

sudo chmod 700 /home/kf/bin/trim.sh

next I added a line to my sudoers file with visudo:

kf   ALL=(ALL) NOPASSWD: /home/kf/bin/trim.sh

When I login again and execute the script with trim I still need to enter my password. I know I can make a cron for this but I also want to be able to execute the script manually without entering my password. Any help appreciated.

edit:

My sudoers file looks like this:

Defaults        env_reset
Defaults        mail_badpass
Defaults        secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin: /usr/bin:/sbin:/bin"

root    ALL=(ALL:ALL) ALL
kf   ALL=(ALL) NOPASSWD: /home/kf/bin/trim.sh

%admin ALL=(ALL) ALL
%sudo   ALL=(ALL:ALL) ALL