swapped all 4 of my couplings from flexible cheap ones to disc coupling from BST as I snapped a coupling in use.

https://bstmotion.aliexpress.com/sto...256823596.html

I made sure all the disc couplings were rated at least 50% more than my motors.

My machine is well aligned Nema to ballscrew should I buy 4 sets of BK12's with angular bearings from BST? Do I need to replace both ends? Or just the BK end?