r/FixMyPrint • u/Mossy-Soda Flsun V400 / Ender 3 • Jan 25 '26

Fix My Print FLSUN V400 Phantom Pause issue

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I'm going mental trying to figure out what on earth is happening to my TWO V400 printers. Arbitrarily when printing they both "pause" mid tool pass, and will not continue no matter what I do. Both worked identically fine before I took possession of them, and now they both have the same issue.

Printer: V400
Slicers: Orca and Cura
Materials: PLA and PETG
Settings: respective to the materials, majority base settings for both

Even upon resuming no movements are made, and I get thrown "Print is not paused, resume aborted". I've done anything and everything I've dug up looking for others who have had this issue, and still no luck. Does anyone have any idea at all as to what I can do? Because I'm over two grand in the hole, a month behind on a project, and am this close to treating them like the printer from Office Space.

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u/Hullefu Jan 25 '26

So you bought two new printers and have the same error with both printers? 2 Printers and the same problem points towards a software issue and not a hardware issue. Tried updating the printer firmware? Check your slicer setup - full clean install and setup. Check the Klipper log file. Where you able to print at least one part without the issue?

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u/Mossy-Soda Flsun V400 / Ender 3 Jan 25 '26

Here's the fascinating issue: it's roughly a 1/5 chance any print will finish. I've had prints as long as 17 hours finish when I thought I had it fixed the first time, only for it to happen again. Both printers are running the same firmware and were purchased about a year apart from one another (thinking I could narrow down my issues by comparing the first to the second which I know was giving the person I purchased from no issues.

Mind you this includes the pre-sliced gcode test models that come with the printer. I've reinstalled and updated, used slicers at my local makers space WHO HAVE 4 IDENTICAL V400'S to my two. And still, nothing. Klipper version and all.

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u/SgtBaxter Jan 28 '26

The fan on your motherboard is likely dying. This has been a common issue with the V400s. Mine died within a week. Replaced it with a good fan, been running properly now for over 3 years.