reply through Amazon, where I bought my printer:
Dear customer,
Thsnks for the kindly email.
For the problem, we have folowing suggestions.
1.Please set the exposure time of the bottom layer to 10s and the exposure time to 2s.
2.Please flash the newest firmware, is 4.3.16.
A.Please format your U disk/SD card firstly.
B.Copy the firmware to the U disk/SD card.
C.Turn off the printer, insert the U disk into the USB port of the machine, turn it on, click the print interface, select the file with the suffix Bin to print, and restart after printing.
Format SD card method: Start=>> running=>> Input command to enter DOS system(win7 system, please input cmd), input format/q g:/fs:fat32/a:4096.
g is the disk number of your SD card. Please noted that right click to format is invalid; SD card capacity must within 2-16G.
3.Change the placement of the prints。
If there is excess curing in the middle of the previous print, you can adjust the print to print around to observe whether there is still excess curing. If it is only in the middle or around it, it is a 2K screen problem 4. Click the "calibration" interface of the operation screen, adjust the test exposure time of the image to 60s, pour the filament into the 2K screen, wait for the filament to cure successfully to clean the 2K screen, the normal situation should be a square with flat edges, if there is still excess curing, the 2K screen is problem.
Please offer us some pictures or videos showing test process.
After our engineers confirmed, if there is problem, and we can send you related parts as replacement for free.
As Amazon does not allow us to receive videos and send firmware through its system, if you need it, then please contact us through this mail box: ｚｚｓｗ－３ｄ＠ｏｕｔｌｏｏｋ．ｃｏｍ
Please remember to add on your order ID when contact us there.
Waiting for your further information to move on.
Best wishes
Judy