Well... I don't trust in luckDadio wrote: ↑Mon Apr 17, 2023 6:03 am That's bad luck Mark , the first one looks great and for running not shelving it's perfect , some of the cheap tires I ran in the 80s had no better finish , you could use one of the failures to try painting a light coat of resin on the outside and curing it to remove blemishes .

First fail : 85%
Second fail : 75%
Third fail : 30% (not the same file).
Conclusion something is wrong. And it doesn't seem to be the build platform levelling, neither the resin. And it should not be exposure as the first print was perfect, further UV exposure works as I can use it to perform a clean VAT... Something other affects the system. Temperature is out of question as I'm running the heater in the chamber, and I didn't change anything in the settings.
That maybe the FEP. Went back home, emptied and filter the VAT, used IPA to clean it, and the material...
The FEP still looks good... But, I took an app on Android to measure frequencies : the frequency given bac by the FAP is about 260Hz, which mean it is probably too low... As matter of fact about the causes I can find for my problem, one is FEP not tight enough... As matter of fact, everywhere I find it should be around 325Hz... And flex resin is highly stressing the FEP... So this might be my cultprit... I'm incline to replace and launch another print, but will still search for alternative solutions...