HiLetgo 5pcs A4988 Stepstick Stepper Motor Driver Module with Heat Sink for 3D Printer Reprap Suitable for Mendel Huxley Arduino

Four out the five worked fine. The fifth one was all over the place when adjusts were made. Fortunately I only needed the four.

I worked but I don’t like the heat sink they use the 3M double side tape to stick on the chips

The heat sinks are too big to install without worrying about causing a short by touching pins. Though, all chips like this have the same issue.

Good so far, all 5 work.

Heres what starred items Amazon wanted me to rate for these stepper drivers. Noise level? Adhesion? Warmth? The vendor should get on them for this nonsense and the poor ratings it might bring. I guess they know not what they sell! But Ill say in defense of the seller and the product that ... Thes are pretty generic, and these work as expected and the delivery was fast.

first shipment didnt work, sending back, replacement on its way.

3 out 5 burned right out of electrostatic bag, all of them came out of the factory with corrosion.

worked right out of box. no bent pins

Really wish these product listings came with a technical data sheet or instructions - I killed two of these drivers before figuring out that you CANNOT disconnect ANY motor pins while the driver is under power, otherwise you are likely to fry the circuit. Otherwise they work well, are very small, and are great for reducing motor control to only two pins.

3 of the h5 packages were already open. I have not tested but I am worried they are blown. :(