QWORK Small V-Wheel Plate, 2 Pack V-Slot Gantry Rod Plate with Wheel, for 2020 Aluminum Profile, CNC and 3D Printer Parts Black Wheel

I haven't used these yet but they appear to be very well made. The anodizing on the aluminum plate is particularly good quality. I've used basically identical gantry plates from OpenBuilds and these are just a nice. Two things to know, because there seems to be some confusion in the comment section: 1. These are intended for use with V-Slot extrusions, NOT plain old extrusions. The wheels are beveled and ride on the beveled edges of the V-Slot. If you try to use it on plain extrusions It will likely be impossible to fit. 2. Two of the wheels have hex-shaped spacers that are used to adjust a cam mechanism to adjust tension. You loosen the screws that hold the wheels on and then rotate the spacer to move the wheel in and out until you take up any play and get the tension where you want it - then tighten the screws back down. There are YouTube videos with instructions.

The reviews about the item saying it doesn't fit are just ignorant on how to use this item. It works perfectly on 2020 extrusion. The spacers under the wheels that are hex shaped are eccentric. You need to listen the nut /bolt and then turn the hex until it fits. Then you can tighten the eccentric nuts a little to snug it up and get the desired friction and then tighten the locknut to keep it in place. I am willing to bet the bad reviews have no idea this is how it is supposed to work. This design is not new by any means and has always been the way it works. So if you are in the market, please read up and understand the proper way to install this. Posting a review saying it doesn't fit is just silly. It fits perfectly fine if you install it properly.

About as close as you'll find to OpenBuilds quality. Easily adjusted to rails and bearings run smooth. For those who are saying these don't work or at least don't fully understand how to use them, check out the examples on the OpenBuilds website or the OpenBuilds YouTube channel. But note, THESE ARE ONLY FOR V-SLOT EXTRUSIONS! They do not work with T-Slot extrusion. If you don't see a smooth bevel on both edges of the channel opening, you've got the wrong channel. These gantries were designed to ride smoothly in that beveled channel and the pieces I received seem to be about as near the quality of the genuine originals as you'll find.

Out of these box these did not fit on 20MM Aluminum Extrusion. I had to use my own hex wrench and pliers wrench to loosen the bolt through axles that have the cam nuts on them. Then, rotate the cam nut so the bolt head positions closer to the edge. This spaces out the wheels and allows the extrusion to pass through them. Once on the the rail you can tighten down the bolt and opposing nut to desired wheel stiffness. Unfortunately, this seller did not explain any of this in the title, photos, description, nor packaging.

It's very simple, but it fits on aluminum extrusion as intended. There are cammed wheels to adjust the fit as needed. I think it's mostly intended for 3D printers, but I bought it as part of a cross cut guide for my circular saw and it works great for that!