Befenybay 2PCS 5mm to 8mm Aluminium Plum Flexible Shaft Coupling D20 L25 Connector Flexible Coupler for 3D Printer CNC Machine and Servo Stepped Motor（5x8mm）

Printer moves much smoother now after this upgrade, fits perfect with my ender 3, excellent quality

I bought two sets of these and both were bad. They are cheap so I did not go through the hassle of returning them again. I strongly recommend looking elsewhere. These are NOT the ones you should get. I struggled for days trying to figure out why the printer was failing, only to find out the problem was with the coupler. Bad on me for trusting a cheap product.

Factory coupler that came with the 3d printer striped right out of the box. Ridiculous I had to order parts the day I bought it. Luckily this piece fits to spec. And I have a second one just in case.

Semplicemente dopo averli installati sulla mia stampante 3d ho riscontrato un movimento delle aste filettate non trascurabile. Da una parte un po me lo aspettavo vista la natura del pezzo (due pezzi separati con nel mezzo del materiale plastico) ma non così tanto. Il problema secondo me deriva dal non perfetto allineamento tra il foro da 5 mm e quello da 8 e questo accentua le oscillazioni.

Such a simple upgrade elevated the z axis binding o had after upgrading to dual z axis motors

Les flexi-coupleurs de ma LeadCNC, monobloc en aluminium casse régulièrement suites aux contraintes elevées en decoupe de bois dur. Ceux la ont lair plus solides, bien quavec un leger backlash qui nest pas geneant pour mon utilisation.

There are better couplings on Amazon. Not only do the allan keys bolts strip very easily but the orange part in the middle separates easily as well if you apply pressure to it, making it a useless coupling for a more heavy duty attachment. I now have to throw these out because I couldn’t allan the bolt to loosen it because it got stripped so bad and it’s not due to poor technique or have it too tight. It’s just cheap. Wouldn’t recommend

I used these on my 3D printer and they work great. Excellent quality

These work perfect for my 3D printer upgrade.

If your planning to buy this to solve z axis wobble, DONT! The hole is not centered and made prints come out worse than ever before! Poor manufacturing quality and not even worth $1 Look elsewhere!