Once I have a “backup” printer I’m planning to rebuild my Prusa into something with a much bigger capacity. I’m leaning toward Ingentis (https://www.youmagine.com/designs/ingentis-a-tantillus-variant) based design with a Kraken hot-end, but is there any reason the design wouldn’t scale-up to something with a 1-meter build capacity?
You’d need thicker shafts, I’d go for 12mm shafts on the outside and 10mm for the crossbar. Apart from that everything will scale as is I think. I’m using direct drive instead of gears now, much quieter and no backlash. Also, Just looking at worm drive for the Z to avoid the bed dropping.
The longer spectra segments might make for a less stiff drive system, possibly causing overshoot at corners when running at high-ish acceleration or jerk settings.
@Tim_Rastall how’s your experience with spectra in that regard?
Thats the plan i am on now. Add 300mm to to you original measurements @Tim_Rastall . I have the frames at the machine shop getting the ends faced and squared.
I’m leaning towards a Mendel90-type machine… seems fairly easy to build and I’d get a lot more z-axis height that the Prusa i2 has.
@Thomas_Sanladerer I’m using 120lb spectra and once it’s tensioned and any stretch has been worked out of it, it has very little slop. The printed gears, however, were a bugger to get aligned and meshed together so there was no lash. Direct drive has solved this.
@Pete_Prodoehl The Mendel90 is a nice machine concept, but i really wouldn’t want to use a moving bed for a 1m³ build envelope. But yeah, as a direct upgrade from an i2, it absolutely makes sense. Makes sure to check out nophead’s source files, everything is generated through OpenSCAD, which lets you adjust every single parameter of the printer.
Yeah I’m looking to get away from moving the bed in the y-axis, too many dismounts at higher speeds and taller objects.