I have now been using the Photon for a few days, and I have some questions that have come up. I will mainly be using it for agricultural scale models, and during testing I have experienced some shrinking that distorts the model after printing. This causes the model to bend and then crack on the outside of the curve. I have attached some pictures showing the problem. The supports were cut away after printing and curing in the sun for 3-4 min total. I turned the model several times trying to get an even cure.
Some info:
Resin: Fun To Do - Industrial Black
Exposure times: 10,5/6,5/50/8 (normal exposure/off-time/base exp/bottom layers)
Printing angle: Tilted approximately 35/35 degrees.
I have a theory that the front side of the model (inside of curve) has cured more than the backside (outside of curve). This would cause the front side to shrink more than the outside, and therefore causing the backside to crack. Am I on to something?
I have ordered an UV LED-strip for building a curing chamber, but haven't gotten it yet. This might make it better.
What can be done to prevent this in the future? Will it help to spray primer on it straight after printing, or leaving it in a dark place until I can apply primer? The models will be painted, so adding primer has to be done anyways.
Sorry for a long post, but hope I have explained it good enough. I have of course searched around for the problem, but there are many similar kind of problems, but still a bit different than mine, so therefore I ask here.
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