I have been in 3D printing for a year now and planning a step up by building from scratch. The Kraken 4 extruder head is more than my Mendel90 can handle without serious modification, and I’ll need it to make parts for whatever I build…
I was thinking of an H-Bot with a large build plate, room for electronics and 4 bowden drives. Does anyone have a design to share ?
Honestly, I love the Ingentis from @Tim_Rastall , it’s a modification of the T-slot Tantillus and already has a Kraken carriage 
It’s setup like the Ultimaker in that it has an overhead gantry, without the racking problems of an H-belt design. To fight the racking, you end up wasting a bit of space with extra linear bearings along the axis parallel to the motor/idler arrangement.
Aw shucks, thanks @ThantiK
It’s working out to be a rather nice little robot but it’s still coming together as I refine the design. Most of the STL files are on youmagine with the last batch due this weekend. With a prevailing wind, I might even get my prototype Kraken installed this weekend, Just went and bought all the bits required to get water cooling going :).
I’m also looking at designing but am still thinking of the core xy, which is a refined version of the hbot that removes the tracking issue. Unfortunately there aren’t many published designs out there so I’ve been dragging my feet
@Tim_Rastall It was yours that got me thinking of going that direction. Are there any areas you think compromise performance ? I currently have some business printing proof of concept or prototype pieces designed by others but multiple extruders would bring it up a notch with mixed material prints.
@William_Frick
There are a few things I’m not super happy with in the current design - Mainly the printed gears that drive the shafts but I have ordered some GT2 pulleys and closed loop belts that I will use to replace them. Other than that, the nema that drives the z axis has to remain energised or the bed drops like a stone - I’m working on a braking mechanism to reduce the rate of descent but it makes restarting a print problematic, on the flip side - the belt driven Z axis gives very fine Z resolution and is much cheaper than a leadscrew driven alternative.
All in all, it is fast, accurate and stable. Total cost is about $1100 USD. It should also scale to larger volumes quite happily - particularly the Z axis which is only constrained by length of T-slot, linear rails and belt. I have a crazy plan to make the Z axis 1000mm.
@Tim_Rastall I remember seeing a link to your design but can’t find it now… please repost !