My slickest/smallest/feature-packed design for an #CoreXY Y_Carriage to date (thing:1283295). I am very happy with it at this time:
It is derived from #Smartrapcore but it has departed from their design quite some time ago. It still has the same distance between X rods so it is interchangeable.
Why vertical x rods? Seems much better to have horizontal.
@Oystein_Krog
It depends where you come from 
… I first entered CoreXY with vertically stacked X rods and maybe that’s why I can imagine better this configuration.
On the other hand when I search online for X Carriages, most of the cool ones seem to be Vertical. Search for “parking extruder” for example.
If you know a good horizontal carriage please point me to it.
Yeah but what are some good designs? I have searched quite a bit and all I like most is a 2012 X carriage of @Richard_Horne : http://www.thingiverse.com/thing:19590
However, I find it a tad large.
Thanks for sharing. It is great to see the large numbers of different design configurations and goals people come up with. It keeps your brain flexible.
Yes, it seems we just can’t settle for a standard …which is also a waste of resources but well…
My goals here were quite common, like minimal footprint, common/easily obtainable bearings, as few vitamins as possible. But then I found about the need of any rods to be supported by screws and if I would add another screw at least it should perform double-function right?
You have 2 screws to clamp down the rods already, why add 2 more at the end?
Beware of vibration will unscrew everything, Better loctite the screw or use nyloc nuts. Now I prefer electronic screw on plastics.
I believe the truth is always half way … but I am glad I usually find myself in the creative boat …even if sometimes there are other more “down-to-earth” issues that should be solved.
@hon_po
the tiny screws are for securly clamping the rods in their “housing” but the belt tension can easily make the rods slip longitudinally inside those holes. The back-screws are there to counteract the tension in the belt.
regarding the carriage - i’m working (slowly) on my design, but in my first iteration my plan was to have a vertical carriage as well, but for more stability and faster performance i planned on adding a 3rd rod, vertically placing it the middle between the 2, but horizontally offsetting it by 20-30mm so you have a rigid triangle.
i abandoned that plan because i got my hands on some really good chinese clone mgn12’s for almost free and am now planning to use them instead.
btw - i’m also using 30x30 square aluminum (45cm pieces) instead of extrusions, because i got them for free, and cut to size (45cm) from a local building contractor. they were going to throw them out as junk (they use them for window frames).
I also thought about using 3 rods but that would make the whole thing too heavy for my taste. I only have rods cut to size so no mgn for the time being.
Good luck with your build and don’t refraing from posting online, some people get more ambitious if they do so
i think it all comes down to your expectations of the machine. i’m looking to improve speed while maintaining accuracy (currently have a prusa i3 which maxes out accuracy at around 70-90mm/s), so the added (very small weight) of another rod didn’t bother me, but i guess without actually testing you can never know…
i am planning on putting my design here once i have it modeled up in fusion360. i’d really like to get input if i’m doing anything really stupid, since it’ll be my first corexy after doing a few i3’s. but right now, my seriously bad CAD skills are the main barrier from that happening, since i have it mostly done in my head.
I am still in the design phase and my own goals are about getting as much accuracy as possible from as simple and easy to DIY mechanical design.
That’s why I plan to use square alu tubes (they are plenty strong, really no need to go T-slot just for that - extrusions are ok for the slot actually and for being used as linear motion systems).
About this Y carriage the only grief I have is that 608s don’t have flanges and any slight tilt (even half gedree) will translate in belt walking off the bearing so I really think I am going to replace 608s with flanged bearings (F694ZZ), two of them making a pulley.
All other errors I see for Y carriages have been taken care of as far as I can tell.