# Form 4L not reading both cartridges **URL:** \ **Category:** Support & Troubleshooting\ **Created:** [May 3, 2025, 9:59am UTC](https://forum.formlabs.com/t/form-4l-not-reading-both-cartridges/44304 "2025-05-03T09:59:04Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![MattRForerunner](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/mattrforerunner/32/20355_2.png) [@MattRForerunner](https://forum.formlabs.com/u/MattRForerunner)\ **Post date:** [May 3, 2025, 9:59am UTC](https://forum.formlabs.com/t/form-4l-not-reading-both-cartridges/44304/1 "2025-05-03T09:59:05Z")
We’ve been trying to get our Form 4L running but it will only read one cartridge and it’s reading only the right hand slot but it’s coming up as the left slot. Not sure if this is a common issue or if I did something wrong we bought this on release day but have been so busy we are just now getting around to set up any advise would be appreciated because I haven’t been able to locate any info on how to fix it ![17462661900954261074581195041830](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/5/3/5330b16b2286f2cf548c9345f3128225615502fb.jpeg) ![17462662119034445099333668671414](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/5/b/5b68da1fa73d72353d30847b4fe5b838437a374a.jpeg) ![1746266244844772190744876811138](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/e/0/e08cb270f8c853596222a41f217e2e9f044599a2.jpeg) ![17462662686192484716933892643969](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/8/2/82dad0b313ed1c1376c66c7c6d9c206782cc79e5.jpeg) ![17462663037545051576117021457165](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/8/e/8e536357822c7d94176eec6901dd1895ee1d7f87.jpeg) ![17462663259181280058129508474258](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/5/8/589736cdde82d24b58f0eee489dbf92282bef076.jpeg) ---
**Author:** ![jessbuck](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/jessbuck/32/21430_2.png) [@jessbuck](https://forum.formlabs.com/u/jessbuck)\ **Post date:** [May 5, 2025, 2:27pm UTC](https://forum.formlabs.com/t/form-4l-not-reading-both-cartridges/44304/2 "2025-05-05T14:27:29Z")
@MattRForerunner, I’m sorry you’re experiencing cartridge detection on your Form 4L printer. This is relatively uncommon for this printer series, but we do have some troubleshooting on our [Support site](https://support.formlabs.com/s/article/Form-4-generation-error-messages#1.6) regarding cartridge detection and errors. I would start there, and if you cannot resolve the issue, I suggest opening up a [support ticket](https://support.formlabs.com/s/contact-support) so that we can get you printing as expected. ---
**Author:** ![MattRForerunner](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/mattrforerunner/32/20355_2.png) [@MattRForerunner](https://forum.formlabs.com/u/MattRForerunner)\ **Post date:** [May 5, 2025, 6:04pm UTC](https://forum.formlabs.com/t/form-4l-not-reading-both-cartridges/44304/3 "2025-05-05T18:04:12Z")
Appreciate the reply already went through the support site stuff none of them match this issue and I have a support ticket open, I sent it in on Saturday. Just waiting on a response ---
**Author:** ![jessbuck](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/jessbuck/32/21430_2.png) [@jessbuck](https://forum.formlabs.com/u/jessbuck)\ **Post date:** [May 5, 2025, 6:32pm UTC](https://forum.formlabs.com/t/form-4l-not-reading-both-cartridges/44304/4 "2025-05-05T18:32:33Z")
Hey @MattRForerunner, it looks like we sent a response first thing this morning. Please check your spam folder and let me know if you don’t see the response. ---
**Author:** ![MattRForerunner](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/mattrforerunner/32/20355_2.png) [@MattRForerunner](https://forum.formlabs.com/u/MattRForerunner)\ **Post date:** [May 5, 2025, 7:16pm UTC](https://forum.formlabs.com/t/form-4l-not-reading-both-cartridges/44304/6 "2025-05-05T19:16:35Z")
just found it wasn’t coming up as a unread message ---
**Author:** ![MattRForerunner](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/mattrforerunner/32/20355_2.png) [@MattRForerunner](https://forum.formlabs.com/u/MattRForerunner)\ **Post date:** [May 6, 2025, 2:45pm UTC](https://forum.formlabs.com/t/form-4l-not-reading-both-cartridges/44304/7 "2025-05-06T14:45:47Z")
just an update to anyone reading this they had me uninstall the firmware and reinstall it manually (didn’t work) then factory reset (didnt work) now I get to take apart the machine and see if the problem is a connection issue more updates to come. ---
**Author:** ![MattRForerunner](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/mattrforerunner/32/20355_2.png) [@MattRForerunner](https://forum.formlabs.com/u/MattRForerunner)\ **Post date:** [June 2, 2025, 12:33pm UTC](https://forum.formlabs.com/t/form-4l-not-reading-both-cartridges/44304/8 "2025-06-02T12:33:02Z")
Update they had me switch out both dispense modules in hopes it would solve this issue but nothing had changed currently waiting for their next response thinking its something in the programming or some wrong in the circuit board ---
**Author:** ![genio](https://avatars.discourse-cdn.com/v4/letter/g/35a633/32.png) [@genio](https://forum.formlabs.com/u/genio)\ **Post date:** [June 18, 2025, 6:40am UTC](https://forum.formlabs.com/t/form-4l-not-reading-both-cartridges/44304/9 "2025-06-18T06:40:21Z")
Hi, did you solved it? ---
**Author:** ![MattRForerunner](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/mattrforerunner/32/20355_2.png) [@MattRForerunner](https://forum.formlabs.com/u/MattRForerunner)\ **Post date:** [June 18, 2025, 12:24pm UTC](https://forum.formlabs.com/t/form-4l-not-reading-both-cartridges/44304/10 "2025-06-18T12:24:03Z")
Yes the weight sensor was broke the wires pulled off and the RFIDs were replaced and everything started working. ---
**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 18, 2025, 12:24am UTC](https://forum.formlabs.com/t/form-4l-not-reading-both-cartridges/44304/11 "2025-12-18T00:24:37Z")
This topic was automatically closed 182 days after the last reply. New replies are no longer allowed.