can this be controlled with a raspberry PI 3 B+?

No. You would need to write custom software for that. The software provided is intended for arduino.

Does the arm enable simultaneous control of multiple/individual servos via position + velocity commands over serial (ie. rpi3, arduino)? Documention?

As far as I no the power supply will only allow 1 servo activation at a time. I think the engineer who designed this arm could upgrade necessary components to allow simultaneous control of servos. At what cost is anyone's guess, but I would like to see search an offer.

is it possibe to create my own app and control it using that ?

Yes. They give you mapping for the serial on their board or you can get your own servo board for pretty cheap.

What other items do i need to buy to make it work? thanks

You don't need other items else, it can work without other items, just purchase it, following instruction video to assemble it, then it will work.

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🤖 Elevate your workspace with the robotic arm that codes, controls, and conquers!

CONTROL YOUR WAY - Seamlessly switch between PC, mobile app, mouse, or wireless controller—ultimate flexibility for coding and creative play.
EFFORTLESS PROGRAMMING - User-friendly graphical interface and offline editing empower you to build complex robotic actions without limits.
BUILT TO LAST IMPRESS - Crafted from premium aluminum alloy with industrial-grade bearings for unmatched stability and durability on your desk.
PRECISION IN EVERY MOVE - 6 high-torque servos with real-time position, voltage, and temperature feedback ensure flawless, lifelike robotic motion.
STEM LEARNING MEETS INNOVATION - Perfect for mastering robotics, programming, and engineering concepts—your gateway to the future of tech.

The Hiwonder-xArm1S is a 6DOF desktop robotic arm designed for STEM education and creative programming. Featuring 6 intelligent servos with feedback on position, voltage, and temperature, it offers precise control and strong torque capable of handling objects up to 500g. Built with a durable aluminum alloy frame and industrial bearings, it supports multiple control methods including PC, mobile app, mouse, and wireless controllers. Ideal for learning robotics, coding, and engineering, it combines versatility with robust design for professional and hobbyist use.

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TT$5080

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Trinidad and Tobagostore

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Product Dimensions	15.49 x 13.97 x 24.59 cm; 1.1 kg
Manufacturer recommended age	14 years and up
Item model number	Hiwonder-xArm1S
Educational Objective(s)	Learning programming, robotics, and STEM concepts
Language:	English
Number of Game Players	1
Number of Puzzle Pieces	1
Assembly Required	Yes
Batteries Required?	No
Batteries Included?	No
tech_spec_battery_description_toys	No battery included
Material Type(s)	Metal
Remote Control Included?	Yes
Radio Control Suitability	educational projects, programming practice, robotics learning, creative showcasing
Color	Blue
ASIN	B0793PFGCY

Robotic Arm 6DOF Scratch Arduino Programming STEAM Robot with Feedback of Servo Parameter, Wireless/Wired Mouse/Mobile Phone Controland Tutorial

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