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It sounds like you received a warped bed. One fix is to use shims (aluminum foil works). If you were to cut out a square piece of foil 235 x 235 and cut a hole in the center maybe 200mm diameter and lay it on the aluminum with the build surface on top, it would raise the periphery. If one piece doesn't work then try two. That would certainly be cheaper than buying a new hot plate.
Another fix is to go to a glass build surface (but you still might need to shim the corners or the glass might rock).
You might try going with an "Initial Layer Height" of .28. That's about the most you can go with a .4 nozzle.
You could remove the hot bed and try to take the "bow" out of it.
Finally you could replace the hot bed. The problem with that is there is no guarantee that the replacement would be any better.
Another Cura release has arrived and in this 5.8 beta release, the focus is on improving Z seams, as well as completing support for the full Method series of printers by introducing a profile for the UltiMaker Method.
We are happy to announce the next evolution in the UltiMaker 3D printer lineup: the UltiMaker Factor 4 industrial-grade 3D printer, designed to take manufacturing to new levels of efficiency and reliability. Factor 4 is an end-to-end 3D printing solution for light industrial applications
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GregValiant 1,330
It sounds like you received a warped bed. One fix is to use shims (aluminum foil works). If you were to cut out a square piece of foil 235 x 235 and cut a hole in the center maybe 200mm diameter and lay it on the aluminum with the build surface on top, it would raise the periphery. If one piece doesn't work then try two. That would certainly be cheaper than buying a new hot plate.
Another fix is to go to a glass build surface (but you still might need to shim the corners or the glass might rock).
You might try going with an "Initial Layer Height" of .28. That's about the most you can go with a .4 nozzle.
You could remove the hot bed and try to take the "bow" out of it.
Finally you could replace the hot bed. The problem with that is there is no guarantee that the replacement would be any better.
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