Sorry for the TERRIBLE renderings–My laptop is quite underpowered for the task 
The printer that I have been working on; CAD nearing its completion.
Please try to find faults with it ! It would help me greatly (to a certain extent )
@Mark_Carew_OpenBuild keep some parts in stock 
Some specs:
Build Area: 400mm x 400mm x 450mm (approx)
Kinematics: Core-XY
Construction: Aluminum Extrusion (T-Slot and V-Slot)
Printer Controller: Azteeg X3 V2.0
Heated build platform w/ 325W 24V silicone heater
Filament diameter: 1.75mm
Hotend: e3d v6 x 1 (potentially upgradable)
Extruder: SeeMeCNC EZstruder (mounting holes in the back)
Almost fully enclosed (except top)
Power supplies: 12V 350W and 24W 350W
Standalone Printing capable
Actual color: BLACK with RGB LED backlighting
Size: 610mm x 610mm x 850mm
Looks good. Can I make a suggestion. Have the weight of the bed come down on thrust bearings versus straight down on the motor and the coupler. You can use a radial zz bearing but they are not really designed for side load, though the weight and force is low in your application.
Plus with thrust bearings you can constraight the rod with shaft collars to keep the rods from moving vertically versus just using gravity.
Great Idea–I think it looks hard in the picture, but instead of the shaft collar and the bearing being supported by the motor, it is being supported by the polycarbonate, sort of like plate (what I modeled it after):
A thrust bearing would be a lot better than the radial bearing that I am using, though, and there is a bearing on McMaster that is basically a drop in replacement for the part–Thanks!
I like the use of extrusion for the gantry. As it is bowden type wouldn’t centering the E3D on the carriage Z-Plane help control any tendency for the gantry twisting, give you a little extra height, and get the fan out of the way ?
Thanks! In regards to the extruder mounting, my tiny brain isn’t fully understanding how to move it. Would I have to lift the Hot-end carriage so that the nozzle is flush with the bottom of the X-gantry, or something else? Sorry…
Nice to se more and more corexy homebuild printers! I am also building my own out of openbuilds parts, its rock solid. On youre z i think you can do without the “outer” wheels, if you can put them on the other beam.
My fault in poor expression. Just thinking if the C of G for the E3D was in the same plane as the gantry’s it would be balanced and less likely to twist the gantry on high acceleration / deceleration. Bonus would be the E3D fan would be out of the way of rollers.
@William_Frick , There is approximately 10mm offset between the Hotend’s CoG and the gantry plane. Would that be significant enough to consider a redesign of the gantry? Unfortunately, the E3D’s fan would get in the way too 
– Whatever’s Necessary 
EDIT: I calculated the center of gravity of the entire Extruder Carriage, and it is only 4mm (above) from the plane of the gantry
Consider changing the hole patten on the motor mounts so you can easily tension the belts by adjusting the motor position.
Assuming it’s all aluminum motor mounts/carriages.
Why not enclose the top?
But looks good! Very similar to what I’m assembling now.
Thanks! I was considering post-machining the motor mounts, but they are just a part that I can get at Openbuilds, and I have to do all of the machining at a friends place–I’m not sure if he would enjoy that.
I would love to enclose the top, just that with the X and Y axes moving around (the bowden tube and cables) would require a lot of acrylic or an entire fume hood (kink of like the makerbot 2X)
@Ishaan_Gov I forgot that the v6 is shorter. 10mm probably would make any significant difference. The total mass is pretty small anyway.
Having some experiance with corexy, build in an intermediary tensioning roller where the belt goes from the motor to the corner idler. It helps with belt slap and even tension between the two belts on corexy is the difference between circles and ovals. Trust me.
@Eclsnowman that is a fantastic idea!
Right now, I intend to put some torsional belt tensioners on all four mounting spots of the belt on the Hotend Carriage–Would I need additional belt tensioning on the stretch between the motor and the far pulley?
@Ishaan_Gov that would work. You just don’t get the advantage of splitting the span. Also make sure all drive belts are traveling perfectly aligned to the x/y axis anywhere the interact with the carriage. Otherwise you introduce trigonometry of the angels and the parts will get progressively inaccurate as you approach the corners.
If I could provide some feedback I think your gantry will be prohibitively heavy unless you use a high torque motor like a Nema 21 for your XY movement and very strong belts. Keeping moving mass to a minimum is key for high speed printing.
Yup, I see where all of those problems could arise–Thanks for the tips!
@Tim_Rastall , One day I hope to exchange the V-slot extrusions on the gantry with some 8mm linear shafts and printed carriages(?) for lightness. Right now, I am using two 5.4 Kg-cm stepper motor for the system
@Ishaan_Gov I just noticed you live in Minnesota. Nice to see another Minnesotan trying corexy
