# Bad print! **URL:** \ **Category:** Form 2\ **Created:** [November 21, 2019, 11:31am UTC](https://forum.formlabs.com/t/bad-print/25479 "2019-11-21T11:31:13Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Komy](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/komy/32/10068_2.png) [@Komy](https://forum.formlabs.com/u/Komy)\ **Post date:** [November 21, 2019, 11:31am UTC](https://forum.formlabs.com/t/bad-print/25479/1 "2019-11-21T11:31:13Z")
So I got new resin tank LT after 1 liter of white resin (I put new one but I guess 100-200ml was in resin tank already old one) print quality drop, I can see lines on some parts although I printed same model with everything same day before. I tried to scrap a resin tank next print (same model ) came better but it still have same problem. I would write this on other thread but that thread was closed like we already said too soon because there was no solution to this? First two prints on new resin tank LT was perfect but then It started to show small layers cured on built plate where they shouldn’t be, during these couple prints models were fine tho, but now models start having problems??? [I was afraid of this and it happen to me](http://forum.formlabs.com/t/wavy-surfaces-and-clogged-bores/25262/7), I cleared optical window month ago. ![20191114_094251](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/c/c6aad762b9630f8af248cf8b21571541e79991fe.jpg) ![20191114_094531](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/0/00eb853fd59ca4a5a10769a027bf7ad009f8c3f5.jpg) ![20191121_075230](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/8/8784b347be01f46d2909f097770a385f3ccfa7f6.jpg) ![20191114_094334](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/a/a5de49d73e0ad2c2b6fb8399eab7923cd3b13574.jpg) ![20191114_094245](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/e/e7884cb2d3cf60284ac289a588b2d982f770bbef.jpg) ![20191114_094534](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/b/b8fdc8e849eacba65cfff27bdab820375db4b55a.jpg) ![20191115_090220](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/9/98dc2319316ee47e0f86f5e46d2c983616090bee.jpg) ![20191121_075244](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/4/4846d4b7252661cb007270690e7f1630e75c920d.jpg) ---
**Author:** ![billb](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/billb/32/5587_2.png) [@billb](https://forum.formlabs.com/u/billb)\ **Post date:** [November 22, 2019, 9:39am UTC](https://forum.formlabs.com/t/bad-print/25479/2 "2019-11-22T09:39:25Z")
Your optics need cleaning. Have you had a resin spill? ---
**Author:** ![Komy](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/komy/32/10068_2.png) [@Komy](https://forum.formlabs.com/u/Komy)\ **Post date:** [November 22, 2019, 9:54am UTC](https://forum.formlabs.com/t/bad-print/25479/3 "2019-11-22T09:54:37Z")
☹ Looks like everything that you are afraid in life it happens to you… Yes i had one drop on optic almost year ago (april), I cleaned it with ipa and microfiber and everything was fine till couple days ago. This optics cleaning inside is it difficult, can I f… up something? Does laser after that cleaning self adjust ? ---
**Author:** ![scooter1986](https://avatars.discourse-cdn.com/v4/letter/s/e56c9b/32.png) [@scooter1986](https://forum.formlabs.com/u/scooter1986)\ **Post date:** [November 22, 2019, 5:12pm UTC](https://forum.formlabs.com/t/bad-print/25479/4 "2019-11-22T17:12:20Z")
it looks like to me your tray is overused or dirty optical or mirror but who knows. maybe check your resin expiration date also. try this: get new tray (not LT) get new resin (standard black) clean optical window clean large mirror inside get the test sample file from formlabs do a test print and see the result. those test prints are optimized to see what is wrong with your printer, such as dirt, calibration, lowering laser power, etc… (use black standard resin, that one is failing sooner then any other resins) ---
**Author:** ![Ante\_Vukorepa](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/ante_vukorepa/32/18125_2.png) [@Ante\_Vukorepa](https://forum.formlabs.com/u/Ante_Vukorepa)\ **Post date:** [November 22, 2019, 5:26pm UTC](https://forum.formlabs.com/t/bad-print/25479/5 "2019-11-22T17:26:59Z")
Assuming optics are clean enough (they’d have to be very smudgy for this kind of effect), the likely culprit is the tank. I don’t have experience with LT tanks, but this is a common symptom of a regular PDMS tank nearing its end of life (due to clouding and/or delaminating). ---
**Author:** ![Komy](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/komy/32/10068_2.png) [@Komy](https://forum.formlabs.com/u/Komy)\ **Post date:** [November 23, 2019, 9:57am UTC](https://forum.formlabs.com/t/bad-print/25479/6 "2019-11-23T09:57:53Z")
so lifetime of [LT is too short for its money](http://forum.formlabs.com/t/lt-tank-lifetime/25201/3)? I had used liter and a half with this tank…? I am thinking to clean optics inside but this problem could be tank… ---
**Author:** ![Ante\_Vukorepa](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/ante_vukorepa/32/18125_2.png) [@Ante\_Vukorepa](https://forum.formlabs.com/u/Ante_Vukorepa)\ **Post date:** [November 23, 2019, 4:00pm UTC](https://forum.formlabs.com/t/bad-print/25479/7 "2019-11-23T16:00:05Z")
No, it shouldn’t be that short, the old tanks were at least 2 liters. More like - a bad tank. But do clean the optics too if you can, just to eliminate all the variables. ---
**Author:** ![Komy](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/komy/32/10068_2.png) [@Komy](https://forum.formlabs.com/u/Komy)\ **Post date:** [November 23, 2019, 5:26pm UTC](https://forum.formlabs.com/t/bad-print/25479/8 "2019-11-23T17:26:52Z")
-75 € 🙂 bought new orange tank, put same model on print if it fail, tomorrow I will clean optics, if I f… up optics, there goes my business. ---
**Author:** ![Komy](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/komy/32/10068_2.png) [@Komy](https://forum.formlabs.com/u/Komy)\ **Post date:** [November 24, 2019, 2:18pm UTC](https://forum.formlabs.com/t/bad-print/25479/9 "2019-11-24T14:18:03Z")
so on brand new orange tank it got even worse, total failure! I got to clean it inside 😅😰 ---
**Author:** ![system](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/5/b/5bc2bdf993ff27c2e0eecab5010b25626fbb327a.png) [@system](https://forum.formlabs.com/u/system)\ **Post date:** [December 1, 2019, 2:18pm UTC](https://forum.formlabs.com/t/bad-print/25479/10 "2019-12-01T14:18:11Z")
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