Saw mention of plum coupler upgrades in the past and they have finally arrived. Fitted them but come across a couple (no pun intended) issues for others to be aware of. (1) Obvious one really but the couplers aren't as svelte as the original spring ones so you loose the Z back to original (280mm), so watch out if you use @Alex9779 firmware Z max without modifying. This lead me to modify the lower skirt of the bed to allow for it to pass over the coupler and also a couple of new bed supports with greater diameter (Drawings to follow once I've proved to myself it works). (2) Taking the dimensions from the original (bed support) .STL it gave a height of 23.25mm, in the process I thought I'd print out some new corners as well, these however, are 23mm high. Not sure how much difference it will make but it all adds up.