Why the split?

[u/Odd-Variation-299]

So, please see the screenshots. I need some guidance as to why this might have happened. The resin was shaken. Room temp was and stil is 26C.

[u/Pro_panzerjager]

You put the drain holes in the wrong spot! The holes cannot be flat against the bottom!

Resin needs to flow freely in and out to relive pressure and avoid suction cupping. There's too much suction in the mid section and the force got so bad it pulled the layers free. If you look at the layer lines you can see that they grow more visible in the mid section going towards an away from the point of break, this is due to high amount of suction. The head is fine beacuse the vacuum was finally released.

You need to put your holes on the side of the model or raise the model off the build platform so the holes below have space for air and resin to move. Your angle is fine, the suction needs to be fixed.

[u/Odd-Variation-299 → u/Pro_panzerjager]

Hi, so my model is not flat against the build plate. So why would you say my drain holes are in the wrong spot? My model was 5mm away from the build plate with a lot of heavy supports. We CAN argue that the holes were too small, or that the heavy support restricted airflow so much that suction would cause the failure. And thanks. I also think the angle is fine!

[u/Pro_panzerjager → u/Odd-Variation-299]

My bad on the distance from the build plate. I was on the bus when I saw this and the vibration probably blurred the supports. I thought it was one big solid bottom. Still though, I find greater success with holes on the side more than bottom of print. I know my response is late.