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It will be a 240x280x70ish speaker stand. The first go ground with it flat and support free resulted in warping despite a 60°C chamber, so I stood it on its end, cut print speed by a third, and added the breaks to reduce stress.
This will take a while...
Note that the bottom has a chmafer, so although there's a shadow it's not warping.
Looks good so far. Make sure to vent/not breath too many ASA fumes.
But it stinks so good!
I've had good results with reversing print-direction on odd layers but for all layers, not just for overhangs.
That's an interesting suggestion. What failure mode have you found that to help with? I am under the impression that the temperature gradiant between the bottom of the print and the top of the print, combined with thermal expansion, is the reason why printed parts warp. ABS/ASA expand/contract twice as much as PLA.
It seems to help reduce warping in general for ASA in my experience. I haven't done a deeper investigation to collect actual data, but anecdotally I seem to have way less issues with large ASA prints warping since I started using it.
Tip: large prints can lift your mag sheet when they warp, some clips like we used in the old days would help. This one doesn't look big enough for that tho.
Make sure the fan is off, recent abs and asa presets in slicers have it enabled. The fan-speed view in the slicer can help.
The printer is a 350mm^3^ Voron 2.4, so the scale of photos of things on the bed is a bit off. I swapped to ACM panels and added radiant insulation after my last big print lifted the bed. All was well until this one, but I also haven't printed any larger rectangular things recently. Printing this 240mmx280mm thing flat lifted the mag sheet.
I've been printing long enough to remember binder clips. IIRC they were originally a reaction to the magnetic sheets originally used getting significantly weaker as temps go up. I would be pretty surprised if clips would help in this case, due to the forces involved thanks to the size of print, but it would never hurt to try I guess.
I’ve been printing long enough to remember binder clips. IIRC they were originally a reaction to the magnetic sheets originally used getting significantly weaker as temps go up.
No, magsheets didn't exist back then, we used mostly glass beds coated with hairspray, kapton tape or whatever we thought would work at the time... the clips were to hold the glass to the heatbed (usually a pcb heater).
Ah, that's true. I guess they carried over into the early spring steel era.
Related: clips are a much better option than using double sided tape to attach glass to your bed. I just pulled my wanhao i3 clone out of retirement for my kids to mess with and getting the beat up ultrabase bed off was lots of fun...