To get back to this topic with some positive news!
I got my printer back! (I hope you did too @Steve_Johnstone, or atleast will get it back very soon).
The support team mentioned my large mirror was replaced and the printer was re-calibrated. However, when returned I noticed the whole Galvo block was changed (new small mirror, new galvo mirrors and what seems to be a new laser (at least the laser pattern is notably different than the old pattern (perhaps this can be done with calibration??)). Had to clean all mirrors after shipment because I could already see a smudge on the small mirror straight after unpacking. I cleaned all the mirrors thoroughly and did a laser spot test afterwards.
Though I don’t know if this is an actual improvement of the laser, I’ve done some testprints:
I’m pretty happy with the results. There are some minor rough surfaces on the cross test piece. Somewhere in between @Ante_Vukorepa’s front and hinge side (just as reference):
The minimum feature test was a decent test. It was printed at 0.5mm and measurements were accurate to about +/- 10-30 microns on most test. A small failure at the end. I don’t know why, but after a little repositioning and it came out flawlessly (I only have a photo of the first try).
The helical walls is what I’m most impressed with. These came out perfect.
One thing I do find strange though, is that the original small feature test print didn’t stick to the base properly and the helical walls didn’t stick to the base from the start. I measured the base of the prints that did stick and these were 2.2mm (instead of 2.0mm). So I lowered the build platform (0.2mm)to print the helical walls again. Again, the helical walls didn’t stick to the build platform. I lowered the platform to 0.4mm with the same result. Therefore, on a hunch, I thought; why not heighten the build platform and see what happens. Maybe I’m going at this the wrong way. So I heightened the build platform with 0.2mm and suddenly the helical walls stuck to the build platform and printed properly…
This doesn’t seem to make sense to me… Perhaps someone can explain to me why the build platform must be set 0.2mm higher rather than lower??
Anyway… Here are my results of the “refurbished” printer:
Minimum feature size test:
Though I realise white isn’t the best color to do tests in, I was out of black resin. Still, I’m pretty satisfied with the results!