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Are there any good plans out there for building a large format aluminum-frame 3D printer by cannibalizing a cheap prusa clone?

I have an A8, which I'm actually quite satisfied with, after some reasonably modest upgrades, but I'd like to print big and my budget isn't. So I'm looking at this thing and thinking I could reuse pretty much everything on it except the frame, the rods, and the build plate.

I figure somebody must have done this using a t-slot frame or something, but I haven't been able to find much in the way of designs that assume you're gonna cannibalize another printer. It seems like a perfectly viable idea though. Looking at this thing, the only thing I'm wondering is whether it would be possible to keep the extruder/hotend assembly on a longer gantry without sagging. I know that printers like the cr-10 use a bowden setup, and I assume that's why.

Have any of you done something like this successfully? Did you use a publicly available design or did you work it out on your own? How did it work out?

Thanks in advance for letting me pick your collective brains.

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