Looking for printer kit/design suggestions, i will need a printer for a highly specialized build (paste extrusion type) and wonder if there are any good kits out there that fits the bill, so i can save the time needed to design a new one 
It needs to:
Eustathios is one possibility- it might need a little customizing
Yeah but 2.5kg extruder on 8mm rods would need some updating. Also is ~285mm sqr in the x/y. With a upsized redesign it could do it
Frankly I’d base a build off the 3040 CNC with ballscrews. Taller Y plates for however tall you need your Z to be…
I know there is a community for Clay 3D Printers. They will probably have more weight problems than “paste” (somewhat vague) would. Maybe checking out “food printer” and “3D printed chocolate” search terms on your favorite STL file site and YouTube and such will give you some hints.
@jerryflyguy oops I did not see 2.5kg extruder assembly- yeah that would require a heavy duty carriage and rods.
@Ted_Huntington the Herculien might be better suited. It’s close to fitting the parameters
@Ted_Huntington , @jerryflyguy , Both the Herculien and the Eustathios is out due to the weak X/Y Ultimaker style gantry, while it is a great design for a lightweight hotend i do not think they will stand up well to a 2,5kg extruder…
@raykholo : I have been thinking about the 3040 solution, or even using a 6040, but they usually have a very short Z axis stroke, and run pretty noisy. I would have to swap the Z plates to much higher ones and design a new Z axis.
@Erik_Cederberg that’s exactly what I suggest.
There are some clay extruding 3D printers where the extruder is stationary except in Z which would ne screw driven and the platform moves in X,Y.
I am curious about using one of the printers with two crossing sets of rods/bars and driving it with threaded rods on the four sides with steel re-enforced timing belts to keep them in sync. It is bound to not be fast unless we figure out faster motor speeds, but it should be suitable for stubborn/heavy effectors. If anyone wonders why not an H-bot, it is because I figure the set of rods going across the middle could still be tempted to twist under high accelleration and decelleration moments…or if the effector is stubborn in other ways.