Dealing with warping that does not occur until after printing
I am seeking advice again.
I have a flat, square model about 200x200mm and 9mm tall with rounded corners. It is a tray with a shallow base and sides. It adheres and prints nicely but warps after it has cooled and has been removed from the bed (regardless of what material I print it in). The centre warps up the most and the centres of the sides are also raised up. Only the corners sit nicely on the table! I have tried heating it with my filament drier and hot air gun and bending it but I either ruin the print or it reverts to the same warp once it cools and any pressure has been removed.
I was wondering if anyone would have any advice on/experience of dealing with post print warping?
Best Answer by Diem:
You can try annealing the print. Place it on a very flat surface and put it in the oven at just below the glass temperature of the filament for an hour or so then let it cool slowly. This is pretty much the same procedure as oven drying filament but you are allowing nearly molten polymer molecules to slip slightly against each other and dissipate internal tension.
You might get shrinkage as part of the process. If so measure the change and calibrate it back into the original print.
Cheerio,
RE: Dealing with warping that does not occur until after printing
You can try annealing the print. Place it on a very flat surface and put it in the oven at just below the glass temperature of the filament for an hour or so then let it cool slowly. This is pretty much the same procedure as oven drying filament but you are allowing nearly molten polymer molecules to slip slightly against each other and dissipate internal tension.
You might get shrinkage as part of the process. If so measure the change and calibrate it back into the original print.
Cheerio,
RE: Dealing with warping that does not occur until after printing
@diem
Thank you. I will try this.
Solution to flat prints that warp as they cool after printing
Thanks for this - it worked. I placed the warped PETG print in my filament drier @ 70 degrees for an hour between two Ender 3 glass beds with a small weight on top. I had to create another model (printed in CPE) to fit on top of my warped model to create a flat surface for the top glass bed to sit on.
I needed a repeatable solution for this problem as this model is going to be printed (and now annealed) in quantity to be sold!
You can try annealing the print. Place it on a very flat surface and put it in the oven at just below the glass temperature of the filament for an hour or so then let it cool slowly. This is pretty much the same procedure as oven drying filament but you are allowing nearly molten polymer molecules to slip slightly against each other and dissipate internal tension.
You might get shrinkage as part of the process. If so measure the change and calibrate it back into the original print.
Cheerio,
Warping from stress
Maybe you need to look at the way the object is slicing as it appears to be inserting stress. I don’t normally get any warping on largish plate prints.
i3 Mk3 [aug 2018] upgrade>>> i3MK3/S+[Dec 2023]
I seem to always have this issue on large flat square or rectangular prints of 150+mm length/width and height of about 6mm plus. The corners stay down but the centres lift by a couple of mm after the print has been removed from the bed. The only slicer setting that I tend to change from recommended is the "Fill Angle" to "0" or "90" instead of 45 degrees so that the top surface looks nicer. I have tried playing with temperatures and different infill patterns. @Diem's annealing solutions works but of course it would be better if I didn't have the problem in the first place!
Maybe you need to look at the way the object is slicing as it appears to be inserting stress. I don’t normally get any warping on largish plate prints.