My CoreXYU Printer project (4 replies)

First a few goals I wanted to achieve with this project:

• Large print volume for printing big objects.
• Print PLA, ABS, TPU and other materials.
• A minimum of two colours/materials in one print.
• Layer height: 0.20+ (0.1 should not be a problem but takes too long to print)
• Print speeds: 60-100mm/s with decent quality
• Travel speed: 250-300mm/s

Quick summary of build:

• Dual extruder CoreXYU IDEX (two carriages share same gantry).
• Outer dimensions without top: 750x750x1200mm
• Build area: 500x500x750mm
• 8mm milled aluminium heated (1400W) bed.
• 40x40 aluminium profiles for sturdy frame.
• 20mm steel linear rods with igus iglide sleeve bearing, 12mm aluminium for gantry, cheap and readily available.
• Heated enclosure (up to 70°C), planning to use PC sheets. Electronics and steppers are located at bottom of printer to keep out of enclosure.
• Three-point auto levelling bed that can tilt at end of print for easy access to bed.
• Air pump part cooling.
• E3D v6 hotends (might consider water cooled hotends later).
• 24V PSU.
• Duet Wifi + duex 5 as controller.
• Remote direct drives for lightweight carriages (Zesty nifty).
• 4 * Neam 17 0.9deg 2A 46Ncm 17HM19-2004S steppers for corexyu.
• 3 * Nema 17 1.8deg 2A 59Ncm 17HS19-2004S1 steppers for bed.
• 2 * Nema 17 1.8deg 2A 59Ncm 17HS19-2004S1 steppers for extruders.
• Quite a lot of printed parts as I do not have access to an aluminium cnc mill (yes, I know printed parts is not ideal for print quality but lightweight carriages might mitigate this problem somewhat).

Originally, I considered a Ultimaker style gantry but got inspired by prot0typ1cal dual corexy project Hlidskjalf and decided to go for that kind of kinematics.
This project is my first 3d-printer build so the design probably has quite a few flaws I’m sure you guys will point out ;)
The end goal is not a finished printer that can be mass produced but a one of printer I can continue to improve and try new ideas on.