Chitubox Slicer is VERY VERY broken [EDIT - it's "network send"]
[EDIT] - it's the "network send" feature - it corrupts files, see next reply/post from me on this topic for details. Elegoo, seriously, you couldn't figure out how to safely copy files over ethernet?
Randomly the slicer will go completely haywire - take slices out of the model, mirror them, and put them on the opposite side of the build plate. At the same time it generates rectangles that cover the entire build plate. See the image above. The worst part is, it's random, sometimes the slicer generates a valid print like this one
, and sometimes with the exact same settings, it makes slices like in the image.
This ruins prints. It also ruins FEPs and after only a week with my Saturn, it has already damaged my screen. The broken slices with the giant rectangles ripped parts off their supports which where then crushed against the FEP and screen by the parts that were still attached to the build plate.
When the slicer fails like this, it doesn't show in the 3D preview. In order to see broken slices, you have to save the slice file, and then re-import it.
Here is the file that was used to create the broken slice file in the image above: https://drive.google.com/file/d/1Ihm5V-KCZwPV71EnpNS-BWOKd-wMu1Ev/view?usp=sharing
I only recently figured this issue out - but already I can say it's happening a lot - all 3 of my most recent prints with completely different files have this issue.
I can confirm this bug. I tested Network Send on 1.6.5, 184.108.40.206, and 1.7. Sending through a stock comcast modem to an Epax X1-DJ. I eliminated all hardware causes with Epax's excellent customer support (multiple printers, screens, and mainboards). I can recreate the issue by slicing with any of those versions of Chitubox, then Network Send to printer. If you print the file, the preview looks fine on the printer. It didn't hurt my printer other than ageing the screen unnecessarily (unlike the OP), but did create big 'flaps' of resin off the model. I've photographed the print screen during numerous dry prints, as well; it matches what the OP is showing. If you take the USB back to the computer, and open the *.ctb file, you can see the problem layers in the preview. I can work with you on identifying the problem. Let me know what you need.
Seen this myself today, Chitubox V1.9.1, Elegoo Saturn with latest firmware (4.4.3). I had changed the SD card to a 32Gbyte one, not for capacity reasons but simply beacuse it's low profile and doesn't protrude as much as the supplied stick. So the first print with the new stick, sent over the network from Chitubox, looked fine on the printer display and so I started the print. Noticed at some point that there appeared to be a 'skin' in the resin, it's old resin a year past its 'best before' date. I initially blamed the resin but it had worked fine with a different print last week. So I thought I would reload the file into Chitubox, where I saw that the 'skin' was in fact multiple layers currupted within the model, a mix of large rectangles or layers with lots of groups of small rectangles. Oddly the file size was identical for both the version created on the PC and the version sent to the printer. Had I continued to print that model it would have been disastrous. Having worked out that the file was corrupted I came across this thread, the idea that it doesn't happen with the supplied USB stick doesn't give me enough confidence to trust the 'send over network' option, and if I then go to the effort of checking the file by reloading into Chitubox by plugging the stick into the PC, well that defeats the object of the network transfer.