Hi everybody. Thank you very much for your help. I will answer everybody.
@behold3d: I have made today my PDMS. it's via waterfall. I have paid attention to any posible raised lip... I think it is very flat. I will make new test(s) today. The idea of using 2.5 MSM was just to see if that helped. I am not telling anybody to use these settings, they indeed will fall off. I see that's the best way to adhere the initial layers, but the subsecuent layers make that the initial layers fall off as we all know... I do not think I have a week bulb. As I have stated before, I have made before dozens of printings (V1.1, red resin, 50 XY, 31.6 Z). I do not understand what is happening now. I think are issues of my build table calibration and as I tell, you, I have made a new one today. I am doing Jewelry by the way, not teeth impressions. The "Cabeza Olmeca" is for prehispanic jewelry.
@Robert-Howle. About first layers overcuring, you are right, they fall off every time. Nevertheless, thinner first layers do not adhere... I now have a bottle of cherry. Nevertheless, I do not understand why in my earlier works, I could work with red resin, 50 XY, 31.6 Z... I promise I will do cherry today. it is just that I do not understand what happened with red resin :-)
@matinum I am not sure, but it seems we are the only ones with troubles with version 1.7.3... nobody mention that they have problems with adhering issues... nevertheless it is very frustrating since I can assure I have used software 1.6 without any problems as I am having now.
@akgold. Thank you for your suggestion, I will also recalibrate build table, placing some pressure when calibrating... It is good to know version 1.7.3 is working for you... I think also the rest of the folks who have upgraded to version 1.7.3. I will make what Robert suggests... to use cherry, 50 XY, 31.6 z. Recalibrate and ask the god of the printers to allow me to print again... :-)