Ingentis build space question…
So I have 8, 7 foot long pieces of aluminum extrusion (most likely a 2x factor of safety)…pretty nifty looking in flat black…the printed pieces will be in orange.
Is it safe to assume a 3 foot cubed Ingentis would be too big for the extruder sizes we use? I’d probably have to use a Hydraulic lift for the build plate. 
If you were doing production quantities of parts you could tandem*2 which would be neat to see !
2 cubes, 2 heads (two Kraken!) and slaved X/Y?
Some combination that would print 2-4 of the same thing at the same time … a gantry with 4 heads - 1 centred in each quadrant …
“Simple Beam Deflection Calculations: In the example below, find the worst case deflection for a beam that is supported at both ends with the load centered over the span. Example: using 1515 extrusion, a length of 30 inches, and a weight load of 50 pounds, you should find the approximate deflection to be .011 inches.”
They have a formula, in a PDF here: http://www.wallawalla.edu/academics/departments/engineering/students/classes/engr480/docs/Extrusions/8020ch1.pdf
But the thing is, the Ulti-style gantry at the top isn’t supported at the middle, it’s supported on the far ends. So 2020 may in fact, be perfectly fine. I don’t think the aluminum extrusion is anything to worry about, I think it’s the bearing rods that you’ve gotta worry about. You may have to beef up to at least 12mm rods - which means some modifications to the printed parts available.
I’m just wondering at what point a ‘normal’ extruder would be hopelessly undersized.
Pretty much any time you’re printing anything more than 1ft cubed. I dare you to print something 3ft cubic, with a 0.3mm nozzle, at 0.1mm layer height.
See you next year!
Yeah, as above, your print time for large parts will constrain you before the tslot and shafts will. If I built a new bot with 1m³ outer dimensions, I’d use 12m outer shafts and 10mm inner shafts, you’d need strong steppers, but apart from that, most of it could be the same, I designed it to scale Bowden tube lengths might be a bit excessive…
Don’t worry about your external extrusion, you can always add gussets or cross beams, that’s what makes the extrusion so nice to use. But they are all correct about the precision rods. Those must be design for proper cross section.
I can’t imagine how long a 3 ft x 3 ft print would take to print, and how would you remove it from the bed without bending something, sheesh. Still looking forward to seeing it.
You should call it the Binford Ingentis 2000
I don’t think I’ll go that large, physical constraints an everything. I think the wife would be a little annoyed if I took over half the diningroom table or the forseeable future.
Looking at +Franc Conen’s video in this feed, I’m thinking I could make the build volume 18"x18"x24" with the center 12"x12" part of the build envelope heated. (or heck, make it 12x12x18" and size everything accordingly.)