100mm Effective Travel Length Mini Linear Rail Guide Lead Screw T6x1 with NEMA11 Stepper Motor for DIY/CNC Router Parts X Y Z Linear Stage Actuator

The media could not be loaded. So far so good. Zero slop. Holding a pretty significantly sized laser without issue. 100mm is actually ~100mm of travel and not just overall length. Solid z axis for laser engravers. I do swap over to a much larger z axis for CNC work, but I am sure this would be good for light duty milling

TL:DR - Good if you NEED compact and are fine with being SLOOOW. If size constraints don't matter, go for a NEMA 17 ballscrew model from the same guys for nearly the same price and waaaay more speed and better accuracy.I cannot speak to others reviews, but for the money this is an ok, specialized bit of kit. They should be fine for any little low load low speed project IF you understand the limitations and are willing to work on it a little. I ordered 3 separate 150mm axis and needed to tear down two and reassemble them to run smoother. They come with no connectors, so I had to order an additional kit to hook them up to a CNC control board running GRBL 1.1 and tested using Universal G-Code Sender. The seller says do 120rpm MAX, but the rule of thumb for lead screws is 200rpm. If you have these in a very low load application with low on time you could probably push this a little higher too. This exposes the main downside of these things: lead screws instead of ball screws. You get worse accuracy and less speed with more friction. However, for the size and price you need to pick your battles. For $15 more from the same seller you can get a Nema 17 stepper with a real ballscrew and run safely about 30X as fast, but it is also twice as tall and wide. Additionally, I can't find a complete kit like this with a ballscrew. So if you wanted the performance bump at the same size package you'd have to do a lot of legwork and spend more on just the ball screw than another axis to find a size like 6mm readily. Alternatively, you could find a higher pitch lead screw, but I'm not sure whats out there and I'm betting accuracy falls off as well.These things are tiny, ~ 1.25 in. X 1.25 in. in profile. The motors do not make much torque so they have a very high reduction lead of 1mm/motor revolution. This means that at the USUAL 16X microstep count you have 3200 counts/rev which will 1. Limit your torque and 2. be unrealistically tight control as 1mm/3200step = 300nm/step... yeah that ain't going to happen. So instead you can run at 8X or 4X micro stepping with a step/mm of 1600 or 800 respectively and still have 1.25um/step even at only 4X microstep. This will also boost your torque per step and let you push the speed up if you do not care about longevity of these things. (I ran them at 800~1200rpm just to see and they did move but one of my axis vibrated VERY angrily lol)One final note is that they did place mounting holes in the bottom aluminum extrusion. You would think they would space the holes so that you could stack them on top of each other for some fun automation, but instead the holes are just ever so slightly off so you need to go caveman at it with the drill/dremel to make them stack.

I was shocked by how expensive some of the stepper motor + linear rails are on this website. So, I turned to Befenybay for an affordable / correctly priced version to build an affordable automated x y microscope stage.I used the 100mm rail for the X position and the 50mm rail for the Y position. With this current setup (A) and some software. I can visit multiple pre-selected position every five minutes (B) and my object of interest has only a minor deviation - 40 pixels at worst- from its original position (C). Hooray! I am very happy with this purchase, and I would highly recommend this product.

I had to order multiple times and items are defective each time. Please avoid from this

I saw a lot of reviews that said when they got it, it didn’t work and they had to order something else and other reviews were somewhat positive. I knew I was taking a chance ordering these, But sad to see really don’t work.

Happy with the tightness of this little linear actuator. No play in any direction except the axis of motion and that is only micrometers!

Ordered two, both have play in the linear bearing. one worse than the other. Play in the linear rail is not acceptable.I returned the worse one and ordered another, will update.Edit:Third is greatEdit 2:way too much slop

The picture attached by the seller as spec sheet specifies the distance between the 4 M3 holes on the slider is 18 mm apart from their respective edges. It is not true. It is not 18. This is really poor behavior from the manufacturer. Anything that has to be attached to the slider will be using those M3 holes and they cannot produce it with similar dimensions as specified. I have been 3D printing with several iterations and it took me a lot of time than I thought it would take because of this stupid manufacturer. Actually, I want to use harsh words than stupid, considering the decorum I prefer to stop it hereNote: In my case, the distance between the center of four M3 holes on the linear slider were 20 mm each.