Heavy duty servo ball valve 1/4" NPT

This is an improvement of my previous design : Direct drive servo ball valve (http://www.thingiverse.com/thing:2131538).
I use it to control the flow of steam out of my DIY boiler, it acts like a proportional valve, tested with Steam at 105°C (221°F).
This design is much cheaper than what you can find on the shelf, but also efficient : full opening takes less than one second.
You will need to drill a 3mm hole on the lever of the ball valve at 40mm from the centre of the ball valve and add a M3 threaded rod bended to have 63mm from the two holes.
The program used on the Uno is "Knob" from the servo library.
BOM :

• 2x "jumper.stl"
• 1x "servo_holder.stl"
• 1x NPT 1/4" ball valve
• 1x MG996R servo (https://www.banggood.com/MG996R-Digital-Metal-Gear-Servo-For-Robot-ZOHD-Volantex-Airplane-RC-Helicopter-Car-Boat-Model-p-78320.html?p=3A07002553965201509W&custlinkid=719992)
• 1x metal arm for MG996R servo (https://www.banggood.com/25T-Metal-Servo-Arm-For-RC-Futuba-Towerpro-Servo-MG995R-MG996R-MG945-p-80611.html?p=3A07002553965201509W&custlinkid=719993)
• M3 threaded rod (https://www.banggood.com/Grade-12_9-Carbon-Steel-Black-Threaded-Rod-M2M2_5M3M4-Length-250MM-p-1030565.html?p=3A07002553965201509W&custlinkid=719994)
• 8x M3x40mm Screws (https://www.banggood.com/Suleve-M3SH5-50Pcs-M3-Stainless-Steel-Hex-Socket-Cap-Head-Screws-Bolts-4-20mm-Optional-Length-p-1217027.html?p=3A07002553965201509W&custlinkid=719995)

Happy building !