If you’re a Mendel90 aficionado (like me) then you might want to check out the latest changes to the X-ends which does away with the crack-prone clamps, and allows the X-motor to get much better airflow.
Aye, looks much better than the older design, which kept sliding on the rods due to the belt tension.
I’ve just had a kit delivered from @nop_head himself this morning with the new printed part designs. I’ll put it together in the next few days and report back.
@Sanjay_Mortimer It’s funny you mention that, I just noticed a crack in mine. That’s two cracks in one week.
My Lulzbot AO-100 (now deprecated) has x-ends with clamps, and I always wondered why it was the only model (to my limited knowledge) to have such clamps. Most models (MM1/1.5, i3…) have only holes that you press fit the rods in…
Pics for us mobile folks?
What is amazing is Github has an web STL viewer! 
Just printed these, and noticed the z-axis nut interface is for a quarter inch nut, not the smaller size included in @nop_head 's kit… debating trying to rig up a fix, or re-assembling to print a modified version
I think you might be confused by the fact the nut trap is now at the top. The hex hole at the bottom is 1mm clearance.
Had a bunch of children put together the M90 kit I ordered for school from @nop_head yesterday.
The new X-ends are really nice - the new bar clamps are a totally robust solution that eliminates the only outstanding gripe I had left on the M90.
And yep, the nut sits at the top of the X-end now not the bottom. I guess this is to reduce Z-wobble at lower Z-heights? When the nut is closer on the screw to the coupler, any tiny misalignment of the coupler has more effect on Z-wobble as the short length allows for less leverage/flex. - I think.
Yes the nut at the top reduces wobble caused by eccentricity. Also the couplings now use neoprene tubing as PVC tubing seems to not always have the bore concentric with the outside. It is also more elastic and the couplings are now designed to be closed fully.
well now I feel like a dope. I didn’t check to see if the brass nut on my kit from December of last year was free to rotate or not - it seemed to small, and I believe the nut needs to be prevented from rotating in order for the carriage to advance. What size nut should go in the now top located position? Thanks @nop_head !
The same M6 nuts should be a snug fit at the top. The size hasn’t changed, only the location.
Not only do they need to prevented from rotating but they also need to be tight enough not to rock or they will cause Z modulation. If you find they are loose wrap a turn of sticky tape round the nut.
Finally took a look at it (mobile version doesn’t do stl preview).
I’d love to see pics of it installed. I might modify my x-end mounts to clamp on both sides of the rods too. What I have now works well, however since they don’t clamp on the outside, the part bows in the middle.