XL dual tool - print fan self test fails on both extruders - Assembly and first prints troubleshooting

RE: XL dual tool - print fan self test fails on both extruders

EyeZack — Sat, 21 Dec 2024 18:02:19 +0000

(Added this to another XL-fan-prob thread) For others who find this post: I had the same issue (after doing a hotend swap), I attempted the fan test calibration to make sure I didn't mess anything up and the test started failing (yet both fans running/working). Rather than trying to dissemble anything (again), I took a small portable vacuum and had it running/sucking close to the exhaust port of the failing fan. Ran the check with the vacuum running and it passed the test. ***Disclaimers: some types of fans when ran 'externally' will produce voltage, which might or might not damage any connected circuitry. Attempt this at your own risk. I minimized the chances by not having the vacuum directly coupled to the exhaust shroud and I only started the vacuum after the fan was running (to assist it getting to whatever speed the test wanted).

RE: XL dual tool - print fan self test fails on both extruders

Byte Arts — Tue, 29 Oct 2024 21:30:17 +0000

Just adding another data point... my brand-new 2-head XL is failing the print fan RPM test also. Ran the test a few times and got 1 fan to pass once. Removed the fan ducts and then both passed.

RE: XL dual tool - print fan self test fails on both extruders

Jim Spence — Fri, 27 Sep 2024 21:45:31 +0000

XL dual tool- print fan self test fails on both extruders.

Has PRUSA arrived at a definite solution for this persistent problem?

I have had identical problems with printer fans test failure on both tools . I have removed the shrouds of both printer fans. This transiently worked on tool 2 but not tool 1. Tool 2 would only pass intermittently with multiple tries. Tool 1 never passed testing.

All fans are spinning and blowing air, run quiet and have unobstructed air flow.

I've tried compressed air to blow out printer fans and checked for burrs. Nothing seems to help. Firmware version is 6.0.0.

Any and all suggestions would be appreciated.

PRUSA Chat frustrating. They want videos of all tools including the fans and tool hot ends, videos of the complete self test.

I have difficulty attaching videos to Email but have enclosed photos. of tools and test result. Not sure of any additional info in video.

RE: XL dual tool - print fan self test fails on both extruders

Manuel.De.Escayola — Fri, 17 May 2024 05:24:07 +0000

Good morning, yesterday I updated the firmware version to 6. When I did the fan test, as you can see I got an error, as you can see in the photo.

I have solved the problem in a much simpler way. Look at the fan on the right (the one that fails) and possibly some dust has accumulated. Therefore, it does not reach the RPM of the test.

In my case, I have an air compressor, I put a nozzle on it to clean dust and clean the fan using pressurized air. (If you don't have a compressor, you can buy a can of compressed air at computer stores to clean computer components).

So, after cleaning the fan on the left mainly (and the one on the right). When the test was repeated again, the test was passed. 😎

RE:

XL beta tester for far too long — Thu, 16 May 2024 22:16:00 +0000

I went back to v5 firmware, still had a fail.. weird. Took the fan off the head, removed shroud and tested. All 5 fans passed. Careful assembly, re-test problem gone. Could not get away from FUSB302B blue screen error in firmware v6.0.0. Apparently it should be addressed in firmware v6.0.xx

RE: XL dual tool - print fan self test fails on both extruders

ssill2 — Wed, 08 May 2024 16:44:13 +0000

Interesting, admittedly I've not rerun the fan calibration since I installed. 6.0.0. Now I'm not going to.

RE: XL dual tool - print fan self test fails on both extruders

XL beta tester for far too long — Wed, 08 May 2024 16:43:50 +0000

Just took on firmware 6.0.0 now all my print fans are failing on my 5 head XL. No reply from support since yesterday.

RE: XL dual tool - print fan self test fails on both extruders

XL beta tester for far too long — Wed, 08 May 2024 16:40:43 +0000

Just took on firmware 6.0.0.0..... ALL my print fans are failing .!. OMG

RE: XL dual tool - print fan self test fails on both extruders

CleverSquirrel — Tue, 05 Dec 2023 06:49:36 +0000

Glad you found the issue!

RE: XL dual tool - print fan self test fails on both extruders

ssill2 — Mon, 04 Dec 2023 23:42:07 +0000

so I just reran the fan calibration, and it of course failed, several times. I think noticed that 1 and 5 seemed to be failing on the part fan consistently. visually they spin up just as they should. I went I had and unscrewed part fan and shroud and put inspected. no issues. they were tightened pretty good though, so when I put back on I I finger tightened them. Ran the calibration again and bingo. I noticed everything on the factory assembled side were very tight, including the idlers etc. I had to mess with idler tension a bit when trying to print tpu the first time.