UniTak3D Ender 3 Pro Belt Tensioner Kit 2020 X-axis and 2040 Profile Y-axis Upgrades for Creality Ender 3 Pro 3D Printer

The stock belt tension system led a lot to be desired. I was going to print a tensioner but wasn’t sure how well it would hold up. Plus I really wanted a cogged idle wheel for the printer. I had seen these from a post earlier and figured I’d give it a try. These work great. Took a little to get onto my printer but it has made a big difference in my print quality. If I get another printer I’ll be looking for another set for that printer.

These belt tensioners fit my Longer LK5 printer perfectly. Obviously they allow me to adjust belt tension without searching for tools. That is a good thing.

Works like a charm, much better than the junk ender ones

As an adjustable belt tensioner, these work exactly as they should. The fit to the machine is good and the components appear to be fairly high quality. Installation is pretty easy using the standard t-nuts. The range of adjustment is good as well, the belt can be far too loose as well as far too tight. The issue I have with this particular kit is that both the X and Y axis are limited in max travel compared to the stock Creality parts. For the X-axis, the tensioner extends towards the hot-end further than the stock tensioner does. The plate that the hot-end bolts to collides with this x-axis tensioner. This limits max travel by about 6mm compared to stock. For the Y-axis, this tensioner bolts to the top slot of the 4040 extrusion where the stock tensioner bolts to the bottom slot. This means the v-slot roller wheels collide with this y-axis tensioner. That results in a loss of max travel of about 10-12mm compared to the stock tensioner. I don't think most people would run into those limits, but I have run into situations where having those few extra millimeters would have been nice.

Something about trying to keep tension on a pulley while tightening screws never seemed right to me. And the stock pulley for the x-axis always seems to bend a little under tension. This replacement very cleverly braces itself against the plate on the back side of the bar, and the tensioner supports the pulley on both sides. It is an excellent solution. The Y-axis benefits from this arrangement as well. The only difficulty, which is true of all T-nut attachments, is in making sure the t-nuts are turned all the way before tightening them. These come complete with all the hardware, so you don't have to cannibalize the t-nuts and screws from the old tensioners.

I have two of these kits installed on my printers. They are a huge upgrade over the stock belt tensioners and are aesthetically pleasing as well. I got this kit because they both match each other. Other kits have a nice X-axis tensioner and the Y-axis is a stamped steel bracket. Good job UniTak3D!

These should be on every 3d printer. A much better way to make sure your belts are factory tight before every print. These are made very nicely out of solid machined aluminum with a nice powder coat paint job. All taps are cut nicely and the pullies are on nice smooth bearings. Easy to install on my SV01. A+

So much better than prying with a screwdriver.