Because I am missing a real large 3d-printer I intend to fabricate a Prusa i3bear based long-bed printer with extended Y-axis with a printsize of 200x, 600y, and 200z.
I started with printing all the components, and laid out the frame.
Everything will be standard i3 Bear, last version except the extruder.
I will use a BIQU H2 for this build, of which I have 2 on stock.
The Y-rails will be linear rails, mounted on 2040 aluminium extrusion.
The heated bed will be 3x 200×200 mm, directly mounted on 2020 extrusion. No height settings for the bed, no nuts that can be warped. The mesh has to take care of any unflatness and/or unsquareness.
On top of the bed, a pei plate will be placed that will have to be custom-made, I will check where to get this. 600×200 should be doable, and otherwise I could always just use glass and stick pei on it.
So- will it work with a heated bed of 3x normal size? Well, I know it will work. I have my A30M running with a 310×310 heated bed including a 4mm glass plate on it, at 150mm/s for infill moves. And it never misses a step.
If you do the math, 200×600 =1200 mm2 and 310×310=945 mm2, not a great difference! I will anyhow put in a bigger stepper for the Y- axis, and I can add a back coupling unit on it, so it will never miss any steps anyway.