could I use a regular 12v dc power block or do I need to use a proper power supply?

Yeah, 12v power brick worked for me, at least for experimental stages, it'll need to have enough current (obviously) to run the motors. Current requirements also depends a bit on how your driver's are tuned and the motors your running.

Which grbl 0.9 is this shield support?the z spindle is swapped at middle of 0.9;1.7a stepper motor is currently not working after i calib vref to 0.75

This seems to work just fine with the grbl .9 at github. I'm using one of these in a drawingbot I built, but my Z is a servo and not a stepper. The XY steppers work just fine. Sorry, I could not be of more help.

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🚀 Elevate Your Creations with Precision and Ease!

PRECISION CONTROL - Enjoy PWM spindle and direction pins for accurate engraving and printing.
COMPACT POWERHOUSE - Lightweight yet powerful, this board fits perfectly into your workspace without clutter.
ROBUST COMPATIBILITY - Designed for both engraving machines and 3D printers, making it a must-have for makers.
MAXIMIZE YOUR PROJECTS - Unlock the potential of your 3D printer and CNC with this versatile expansion board.
EFFORTLESS CONNECTIVITY - Manage up to three stepper motors with just six IO ports for seamless operation.

The HiLetgo 2pcs A4988 V3 Engraver Drive Shield is a compact and efficient expansion board designed for Arduino-based 3D printers and CNC machines. It supports up to four A4988 stepper motors, operates on a voltage range of 12-36V DC, and features PWM spindle and direction pins for enhanced control. With its lightweight design and easy connectivity, this board is perfect for hobbyists and professionals looking to optimize their projects.

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Manufacturer	HiLetgo
Brand	HiLetgo
Item Weight	2.29 ounces
Package Dimensions	5.2 x 3.15 x 1.61 inches
Item model number	3-01-1086
Is Discontinued By Manufacturer	No
Color	Red
Number of Items	1
Size	Small
Manufacturer Part Number	3-01-1086-UK-2PCS

HiLetgo 2pcs A4988 V3 Engraver Drive Shield 3D Printer CNC Drive Expansion Board for Arduino 3D Printer CNC

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