I am having an issue with prints not beeing fully cured on the inside. The outer skin of the models seems to be cured well enough. But on the inside sometimes are huge hollow areas. Sometimes the complete model. This does not only occure to the model itself but also to the raft. (The arae underneath the letters is barely cured)
I haven’t used the printer for 2 weeks. After that the first prints came out perfectly. Currently the printer is running nearly 24/7 and the prints are getting worse and worse. I print quite a lot of small models at the same time. Therefore a lot of support structure and raft.
I know that the laser power of diodes decreases over time and operating temperature so could it be that the diode has become too weak?
In my understanding the support, raft and outer skin of models is cured for a longer time than the infill of a model. Therefore these areas are cured well enoughl. The infill on the other hand is cured for a shorter time and (in my case) remains liquid.
I am using a new LT tank, mirrors and glass plate are cleaned.
I had that same problem middle of last year. After 6 weeks of email conversiation with different people from formlabs support they told me that they don’t know what is the reason. They can only offer me a repair for 900€.
They also told me that formlabs is using a laserdiode that does not get weaker over time and temperature. To be honest I dont belive this. Does anyone of you have a similiar problem or a solution? Can I increase the curing time in open mode?