Bad prints out of brand New Form 3

[luben111]

Hi,
I’m printing flat shells on Form3 and I found an effect of parasitic curing of the residual resin which affects the quality of the surface facing towards the build plate.

Form 3 print looks like it has cake icing on it

Hi, I’m printing mainly thin flat shells on my Form3 and I have seen many times exactly the same effect. I can tell you that it’s not old resin, not bubbles and not low temperature. What I found is a process I call “parasitic curing of residual resin” - it occurs when I do printing of flat surfaces oriented close to horizontal, which are facing to the build plate (the side not facing to the build plate is not affected by this effect). It’s parasitic resin curing - when the resin stays for longe…

This week I found another phenomena while printing flat shells - the supports are projected (as camera obscura) over one of the surfaces

with some filtering to highlight the details things look like this

and close to the end of the supports

If you notice the projection of the supports is crystal clear and on focus. My guess is that somehow the beam is curing parasitically the residual resin that stays on the object and it can explain partially some cases of the low quality you witness on Form3.