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

Product ID: 32045987

Details

Brand
HiLetgo
Item Weight
0.07 kg
Material
Metal
Model Name
A4988
Voltage
36 volts

⚡12-36V wide voltage range

🔧4-axis multi-motor control

🛠️Micro-stepping up to 1/32 precision

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Description

⚙️ Unlock pro-level CNC & 3D printing power with precision and ease!

COMPACT EXPANDABLE - Two boards included for dual setups or multi-axis expansion—perfect for pros who demand more.
ROBUST POWER HANDLING - Operates seamlessly on 12-36V DC, ensuring stable performance across projects.
PLUG PLAY VERSATILITY - Compatible with A4988 and DRV8825 drivers, plus PWM spindle control for CNC and 3D printing.
PRECISION AT YOUR FINGERTIPS - Supports micro-stepping up to 1/32 for ultra-smooth, accurate motor movements.
EFFORTLESS MULTI AXIS CONTROL - Drive up to 4 stepper motors with just 6 IO ports—maximize your Arduino’s potential.

The HiLetgo 2pcs A4988 V3 Engraver Drive Shield is a compact, versatile expansion board designed for Arduino-based 3D printers and CNC machines. Supporting up to 4 stepper motors with micro-stepping up to 1/32, it runs on a wide 12-36V DC range and is compatible with A4988 and DRV8825 drivers. Ideal for professionals seeking precise motor control and multi-axis capability in a reliable, easy-to-integrate package.

Specifications

ASIN	B01D2HL9T8
Best Sellers Rank	#65,723 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1,096 in 3D Printer Accessories
Brand	HiLetgo
Brand Name	HiLetgo
Customer Reviews	4.6 out of 5 stars 295 Reviews
Item Weight	0.07 kg
Manufacturer	HiLetgo
Material	Metal
Material Type	Metal
Model	3-01-1086
Model Name	A4988
Number of Items	1
Part Number	3-01-1086-UK-2PCS
Voltage	36 volts

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Bs.284

Duties & taxes included

In stock

Sold byAmazon BoliviaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Bolivia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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