how necessary is bed heating anyway?

[damian238]

I wonder if we are forgetting the nature of this beast. How far can we stretch "no supports"? In an extreme case could we not print a dinner plate 1 mm off the bed as long as there was some initial attachment to the bed? A mid-air coil the size of the bed might be too much. In some cases won't the print benefit from being started on top of a stand (where you start the first layer on the stand)? What are we talking about then? Heating the top of the stand or melting some of the filament (of some other adhesive) to the surface of the stand? Fixing the stand to the build plate - magnets? Given that not only the mass of the build plate, but as (or more significantly) the diameter is a huge factor when changing direction of rotation, should that be an inducement to confine the diameter of it to as small as possible? Has anyone given thought to the moment of inertia of the model itself as it's spun back and forth? I for one chose my End5+ because it was NOT a "bed slinger" style printer. Lastly, in zero gravity, would this be better or worse than an xyz gantry?

[Bolado]

In an extreme case could we not print a dinner plate 1 mm off the bed as long as there was some initial attachment to the bed? A mid-air coil the size of the bed might be too much. In some cases won't the print benefit from being started on top of a stand (where you start the first layer on the stand)? What are we talking about then? Heating the top of the stand or melting some of the filament (of some other adhesive) to the surface of the stand? Fixing the stand to the build plate - magnets?

What's the issue of using a flat surface (bed surface) as the "stand"? Nowadays there are specialized glues you can use on top of the bed plate or on top of tape, so in the end will depend on which material you want to print with, materials which really require heated bed usually requires high ambient temperatures anyway (ABS/ASA, etc) due shrinkage, so for this design in question, I would say that heated bed is more like a commodity of not needing any bounding agent for every print, but this commodity comes with the weight cost, although if you have a decent stepper that has some torque force to it, shouldn't be too detrimental.

Has anyone given thought to the moment of inertia of the model itself as it's spun back and forth? I for one chose my End5+ because it was NOT a "bed slinger" style printer

Downside of the bed slinger can be that you throw around the Y, yes, but don't forget that on a Core XY you throw around the whole gantry on Y, so if you compare a 1kg bed slinger Y with two steppers against a Core XY with a 1kg gantry when there is only two steppers for both X and Y, the bed slinger probably would wield better results.

[damian238]

"What's the issue of using a flat surface (bed surface) as the "stand"?"
In some cases you might be making a model that would otherwise hang down lower than the bed. Printing a stand out of filament for each print like that could be avoided.
I guess I had nightmares about prints flying off the bed as they were shook back and forth. Not so much a problem with low profile prints as with tall ones.

[EmmanuelMess]

We used a piece of wood with paper tape and lots of glue for the first prints, it seems to stick fine. But haven't tested complex prints yet.