This mount/adapter will allow you to install Stealthburner toolhead on you Neptune 3 printer. I have tested this on Pro version but should work with Plus and Max.

Why? 

Stealthburner toolhead will allow you to use different hotends for higher flow rate, speed and will also improve cooling performace. And its pretty : )

Keep in mind that I have used this with Bambu hotend, ideal probe position can vary depending on the lenght of your hotend.

Update: U have to use springs/rubber spacers for the bed.

What do you need?
PETG or ABS/ASA filament
2x M3x20 screw
1x M3x14 screw
1x M3x8 screw for mounting probe
7x M3xD5xL4 heat insert
And of course stealthburner toolhead itself