Here is an updated picture of my giant i3 build.
@Nuker_Bot_NukerBot_3 check it out
Te deseo la mejor suerte.
@D_Rob
Had real problems with bed weight with his big bot. How are you going to deal with it?
Wow, are you going to use 2 motors for the Y axis?
I’m going to build a light weight y axis and am planning on only using one motor. I’m hoping to keep the y axis under 2 pounds.
is there a place where i can find the process pics? looks fascinating
What’s your hoped production size?
Thx.
@Mike_Ashcraft just one motor is not going to be enough to get decent speeds. I’ve got a (granted, quite massive) double-wide bed on my Mendel90 and am already using two motors.
And you are still going to add a supporting frame to the Z-axis, right?
It does look awful flimsy but I imagine there are some structural elements not shown. Are you beefing up your linear rails as well? I’d say for a bot of this size, you’d want at least 10mm, If it were me I’d probably go for 12mm as shaft is relatively cheap. Ditto to what Thomas say’s above. I found that a reducing the bed weight was critical to getting fast acceleration without slipping.
@Thomas_Sanladerer what is the max build size of your Mendel90 and do you have a close up photo of the surface finish you achieve, please 
Thx.
@James_Rothschild_JRP my build size is (XYZ) ~420x200x220mm, although i haven’t used the full size yet - even with a fully enclosed build chamber, ABS still warps a bit too much for my liking. Surface quality is not as good as i’d like it to be, but it’s certainly usable. Google Workspace Updates: New community features for Google Chat and an update on Currents
But let’s not hijack @Mike_Ashcraft 's thread here.
Cheers
I’m planing to attach the z axis to the wall at this point to stabilize the X axis movement.
For the bed I’m either going to use dibond or 1/2 inch pink ridged foam with a layer of aluminum glued to the top to make “poor mans dibond”.
Right now a lot is up in the air but its starting to come together for testing. Thats where the real bugs will show themselves.
Worst case if this dosnt work I’m going to cut it all down to normal i3 size and still end up with a working printer. Just more work but if it works I will see you from inside my fully 3d printed storm trooper helmet.
lol, I see why you want to do this now. check this guy out! http://www.youtube.com/user/jamesbruton