Need to pick some brains. Recently, everything I print produces a rectangular blob like the one below, regardless of what file I print. Occasionally, it will continue printing beyond the blob, and I'll get a partial structure, or if I'm really lucky, a complete structure with little flappy single layer pancake blobs stuck to it every 5 mm or so.
I've changed FEP liners, releveled twice, made sure the screen is extra clean (running one of my few remaining alcohol wipes over it then using a razor blade to make sure there's no resin stuck to the screen) and there are no visible scratches. I'm using a Kensington USB drive instead of the one that came with the machine. I'm printing with elegoo grey resin (though it did the same thing on my last prints with Anycubic Maroon)
Any ideas what's going wrong or recommendations for what I should check next?
翻譯年糕
Bob Deblier
2020-03-22 14:01:51
Have you run a resin calibration test (assuming you have a classic Photon) or the RERF test (if it's a Fauxton) to find out the correct exposure time?
Troy Wood
2020-03-22 14:09:47
I haven't, but I've been printing nothing but successful prints with the same exposure settings for months, then I started noticing stuff stuck to the FEP vat that progressively got worse and worse until it was unusable. I figured it was probably because I had been using the same FEP liner for about 4 months straight, and it was starting to get cloudy, so I switched it out, but the exact same problem persists.
Troy Wood
2020-03-22 14:11:00
I should also mention the shape is the exact same size, approximately the same shape as the inner square of the UV Test. This occurs even if I'm printing a small item, about the size of a quarter, right in the middle of the build plate.
Bob Deblier
2020-03-22 14:17:07
Each bottle is different. Ambient temperature affects exposure time as well. Your LED also gradually becomes weaker. You've been lucky so far. Go back to the basics: calibration test first.
Richard Günter Dölz
2020-03-22 16:40:24
Are you running the original Firmware on the printer, if so it could be frame shearing.
Troy Wood
2020-03-22 16:50:21
I updated it shortly after I got the machine... about June/July of last year, because I was having some issues where it would just die in the middle of a print. Haven't had a single problem (that wasn't operator error) in the 8 months or so since.