Brainstorming an IDEX mod for an Ender 5 Plus

 I've been grinding out parts on a refurb E5P for a few years now, but have always wanted to be able to run multi-filament, particularly for water soluble support material so I have more flexibility in how I design parts.  It would also be nice to be able to mix rigid filament with TPU... or maybe the occasional multi-color thing, but that's not really an interest. 

What are some design considerations?

• Must be an improvement on flow rate over my current setup.
• Symmetrical tool heads for simplicity - I'll use the same parts, hotend, etc on both toolheads.
• Re-using the existing gantry tube, but the current hotend setup won't work.  I'll move it to another machine.
• Add linear rails for the Y axis and probably split out the y motor to one for each corner (dual drive).
• Using Hybrid Core XY for the toolheads so the steppers can sit on the corners by the Y axis motor.
• Need to figure out what to use for bed leveling.  Thinking about the voron tap setup.
• Also need to settle on the toolhead...  I was thinking about a standard Stealthburner setup, but I've been seeing these integrated units that look really good:
• LDO Smart Orbiter v3.0 - Revo Edition - this comes with an HF revo hotend and 60w heater, and looks like a nice compact package.  
• Down the road, I'd like to do a 3-motor bed leveling setup like hydra.
• Considerations for enclosing the build chamber for better abs, etc, support.  That's one of the nice features of the proper voron machines.  If I put the gantry below the top rails, it'll be easier to put a top on the box, but still need to leave the sides open for  the gantry belts and stuff, depending on how I rig it up. 

Is it cost effective reworking a machine like the E5P vs building something like a Tridex?  I think so, but I'm still running the numbers. 

• $200 per toolhead
• $150 for linear rails
• I already have extra steppers and wiring, 9mm belt, and pulleys.  
• Misc hardware will add up.
• CAD time
• Hydra bet setup is like $400
• Lexan side panels ??

An equivalent tridex would be

• $900 for a formbot 350mm trident kit with hv revo hotend parts
• $200 for a second hotend parts
• Misc hardware to go the tridex route.

If I don't do the hydra print bed thing, then I'm way ahead modding my machine, but I'd arguably have a lot nicer machine going the tridex route. Huh.