# Form 3 Mixer Arm not moving, LPU grinding sounds **URL:** \ **Category:** Form 3/3+\ **Created:** [March 20, 2021, 10:46pm UTC](https://forum.formlabs.com/t/form-3-mixer-arm-not-moving-lpu-grinding-sounds/30616 "2021-03-20T22:46:06Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Estefez](https://avatars.discourse-cdn.com/v4/letter/e/439d5e/32.png) [@Estefez](https://forum.formlabs.com/u/Estefez)\ **Post date:** [March 20, 2021, 10:46pm UTC](https://forum.formlabs.com/t/form-3-mixer-arm-not-moving-lpu-grinding-sounds/30616/1 "2021-03-20T22:46:07Z")
Hello, I’m having a new issue with my Form 3. During a print the mixer arm doesn’t move across the tank at all. Also when the LPU moves it makes a grinding, almost screeching sound. Has anyone run into this? Earlier I had to clean the LPU glass due to a piece of lint causing print issues and it ran fine after that for a couple prints. I also updated the hardware and Preform software. Any help would be greatly appreciated!! ---
**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:** [March 21, 2021, 10:24am UTC](https://forum.formlabs.com/t/form-3-mixer-arm-not-moving-lpu-grinding-sounds/30616/2 "2021-03-21T10:24:07Z")
Yep You need to clean and re grease the X lead screw. ---
**Author:** ![Estefez](https://avatars.discourse-cdn.com/v4/letter/e/439d5e/32.png) [@Estefez](https://forum.formlabs.com/u/Estefez)\ **Post date:** [March 21, 2021, 5:04pm UTC](https://forum.formlabs.com/t/form-3-mixer-arm-not-moving-lpu-grinding-sounds/30616/3 "2021-03-21T17:04:58Z")
Thanks! I’ll give that a go once the grease comes in the mail. ---
**Author:** ![lslslslsl](https://avatars.discourse-cdn.com/v4/letter/l/df705f/32.png) [@lslslslsl](https://forum.formlabs.com/u/lslslslsl)\ **Post date:** [March 22, 2021, 9:48am UTC](https://forum.formlabs.com/t/form-3-mixer-arm-not-moving-lpu-grinding-sounds/30616/4 "2021-03-22T09:48:11Z")
I am having exactly the same problem as you, for sure its not a problem of cleaning. ---
**Author:** ![lslslslsl](https://avatars.discourse-cdn.com/v4/letter/l/df705f/32.png) [@lslslslsl](https://forum.formlabs.com/u/lslslslsl)\ **Post date:** [March 22, 2021, 10:05am UTC](https://forum.formlabs.com/t/form-3-mixer-arm-not-moving-lpu-grinding-sounds/30616/5 "2021-03-22T10:05:32Z")
> [@Anyone Help, my Form3 is dying! Scary sound!](http://forum.formlabs.com/t/anyone-help-my-form3-is-dying-scary-sound/30633): > > Hi All, My Form3 is dying!!! Please check this video for the scary sounds! [[Form3 Scary Sound] ](https://www.youtube.com/watch?v=xKUzhXksE1E) Here is what happened: I am printing with tough1500 resin, using a brand new platform and resin tank. I printed 3 times and they all failed because of the same problems. Firstly, the printer will finish the first 3 or 4 layers nicely (see the photo of the platform). Then at some time point, the laser module will stay at the leftmost position and keep generating scary sounds in the video! … please check my topic here ---
**Author:** ![Diana\_Maryschka](https://avatars.discourse-cdn.com/v4/letter/d/34f0e0/32.png) [@Diana\_Maryschka](https://forum.formlabs.com/u/Diana_Maryschka)\ **Post date:** [April 25, 2021, 9:32pm UTC](https://forum.formlabs.com/t/form-3-mixer-arm-not-moving-lpu-grinding-sounds/30616/6 "2021-04-25T21:32:08Z")
> [@billb](#): > > Yep > > You need to clean and re grease the X lead screw. How did you do it? What kind of grease did you use? Could you send a picture what has to be cleaned and greased? Thank you. ---
**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:** [April 26, 2021, 7:44am UTC](https://forum.formlabs.com/t/form-3-mixer-arm-not-moving-lpu-grinding-sounds/30616/7 "2021-04-26T07:44:19Z")
> How did you do it? I cleaned the screw with a toothbrush, then spread grease along the screw > What kind of grease did you use? Lithium Grease > Could you send a picture of what has to be cleaned and greased? If you remove the tank the x-lead-screw will be in front of you along the back wall of the printer. ![IMG_1625](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/f/5/f59f37ddf1bafc6d33727fbf87a33a97411dfc5f.JPG)