Fuse 1+ self prime after print

has anyone else had this happen?

I started a Nylon 12 bed temp tuning calibration print yesterday. I got the text that it finished early this morning and when i got to work the machine was in a Primed state and the camera feed was black. I unprimed the printer to open the door and found this….

I am waiting for a response from support but the community is usually faster.

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firmware 1.23.0-2704

Woah, that’s not good. This has never happened to me. Are the bed temp printed plaques in there?

AFAIK the printer doesn’t allow you to prime after a completed job until the chamber is removed and replaced. I don’t think the printer can be primed remotely either. This seems like a really bad firmware bug. My totally uneducated guess would be that it’s related to the bed temp job, and potentially OMM (is this printer OMM?)

Or maybe it’s related to this bug that was supposed to be patched in the 1.23 firmware update:

Bug fixes:

  • Overlapping prints: Resolved a bug where two jobs uploaded in quick succession to a primed printer could result in the second job printing on top of the first.

this is using formlabs nylon 12, with the calibration print (firmware version 1.22.0 or later)

Yes, all the parts were in the cake and the temp shield on top was forced into the frame of the machine and is warped from the force. The quarts bulbs look intact but are covered in powder. I have cleaned the machine but havent touched anything other than lowering the print chamber so i could remove it.

i am about to start digging into the machine to see if i can find fine detail logs to see when this Priming sequence was initiated and hopefully if it was initiated by touch screen interactions (unlikely since no employees were clocked in during the time frame) or by the software on the machine.

While i wait for formlabs to reply, i am retasking the FDM machines to cover while this machine is OOS.

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Holy cow man, that’s crazy! I am keenly interested in what caused this. I cant imagine what it would look like if you had a full chamber in there.

The top heat shield saved my butt. It stopped the smaller plates from getting smashed into the glass covers for the laser and camera. The top heat shield is deformed from holding back the rest of the cake, it caught on the rails above the quartz tubes.

Hey @CARobertM, could you please upload the logs from the Fuse that this happened on? I will have our engineers take a look to figure out what caused it. Thanks!

for clarification, you want me to publicly post the logs?
I cant seem to access the support ticket i submitted. I didnt even get a confirmation email for the ticket.

Hi Robert,

Nope, you can upload logs directly from the printer!

  1. Tap the gear icon on the bottom left of the printer’s home screen. The Settings screen appears.
  2. Tap System. The System screen appears.
  3. Tap Upload Diagnostic Info. A confirmation message to upload diagnostic information appears.
  4. Tap Next to start the upload. A confirmation message appears when the upload is complete.

I’ll do this at some point today.

It’s a shame I can’t view the diagnostic logs myself. I guess just another example of not owning what you buy anymore.

Hi Robert, you actually can download the logs locally, but likely would not be useful to anyone outside our support and engineering teams for diagnostics.

Downloading printer diagnostic logs through PreForm

  1. Open PreForm.
  2. Click Edit Job Setup. The Job Setup window opens.
  3. Select the printer’s serial name.
  4. Click Download Logs. A confirmation window appears.
  5. Click Browse to download the diagnostic logs to a preferred location on your computer.

Hope we can resolve your issues soon.

that was my first step and I realized they were useless.

More locked doors. Shame.

In case you guys didn’t find it, logs were uploaded yesterday.

What about ghost touches on the display.

We have that on 2 out of 4 printers. I was horrified when i saw the display asking to abort print.

Never gone further than that thankfully.

This affects both Fuse 1 and Fuse 1+

I actually swapped out a display a few years ago and it disappeared.

I don´t see why it should not happen in idle mode and hit Prime printer before you are able to take out the chamber. Thankfully that has not happened to us.

I have seen that a handful of times, where it was trying to start a previous print.

Hi Robert,

After reviewing the logs, we can see that the print finished at 04:50 UTC on October 31st, and then priming was initiated from the UI at 08:25 UTC. From what we can tell, this wasn’t an automatic action triggered by the printer’s software, it looks like it was likely a physical press on the screen that kicked off the priming workflow. That said, there’s still a small chance this could be a hardware issue or something else unexpected.

You mentioned no one was around when it happened. if that’s the case, it might be worth double-checking if anyone could have passed by or interacted with the machine around that time. We’ve seen very rare instances where ghost touches can occur due to display issues, so we’re not ruling anything out completely yet, and will continue to look into it from a technical perspective.

FYI our services team replied to your ticket on October 31st at 12:57PM EST before this thread was started, and is still waiting on a response from you. Please let me know if you received the reply, as that is where the services agent will help resolve your issue.

I have already confirmed that there was only one person in this building before me at the time and that withing 1 minute of their phone connecting to the wifi network, their workstation powered on and connected to the network and their slack account was active until I arrived 10 min later.

No one physically interacted with the machine that’s in the workshop downstairs.

I also have ZERO email communication about this from support. The only messages I have are from from notifications.

The machine is currently sitting, not making parts because I don’t trust the machine not to destroy itself.

And there definitely wasn’t anyone in the building at 1230 AM.

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Hi Robert, please check your spam folder, I am seeing the reply on my end on October 31, 2025 at 12:57 PM EST from support@formlabs.com with your case number and info. I will have the services agent follow up again in case it got lost in your inbox! Hope to resolve this issue soon, thanks Robert!

Everything that includes “formlabs” is filtered to a specific folder. My spam folder doesn’t have anything from formlabs.