XL dual tool - print fan self test fails on both extruders
 
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ssill2
(@ssill2)
Noble Member
RE: XL dual tool - print fan self test fails on both extruders

I'm going to try this before I start loosening/removing shrouds.

Posted by: @mabau

Flashing the newest firmware 4.7.2 did the trick for me (or maybe it was extreme luck on the slot machine as I tried it about 15 times, switched FW and it worked).

 

Posted : 07/11/2023 3:02 pm
ssill2
(@ssill2)
Noble Member
RE: XL dual tool - print fan self test fails on both extruders

so after reflashing firmware and about 15 runs of the fan calibration, it worked! lol   totally a software problem.  I was all ready to start loosening and removing shrouds too.

Posted : 07/11/2023 10:50 pm
Mabau liked
ludodg
(@ludodg)
Estimable Member
RE: XL dual tool - print fan self test fails on both extruders

if you have to redo the test 15 times it doesn't seems to be a software-problem for me. Software is stupid simple. There must be an issue with hardware. As suggested earlier, my guess is, it's a burr somewhere.

I guess I'll have to start disassembling the fan shrouds as well.

disappointing, i can not deny.
ordering, having to wait TWO years for your printer, assembling with attention to details ... and it fails ate the FIRST test. 🙁 🙁 

Posted by: @ssill2

so after reflashing firmware and about 15 runs of the fan calibration, it worked! lol   totally a software problem.  I was all ready to start loosening and removing shrouds too.

 

Posted : 04/12/2023 10:40 pm
CleverSquirrel
(@cleversquirrel)
Eminent Member
RE: XL dual tool - print fan self test fails on both extruders

I had an issue with one of my fans. All the others passed after a couple/few tests. I was getting one tick at the top, but a red cross almost immediately in the test cycle for that fan. The fans that were ok, but needed a few tests, failed later in the test cycle.

Swapped the extruders around and the issue followed the extruder. Took the fan shroud off and found the fan was spinning but producing no airflow. Prusa sent me a new fan—on dismantling I found they had screwed through the fan wire, so worth checking this too. Replaced the fan, and they all passed a lucky first time.

The other issue I found on assembly (so caught it early) was one or two of the fan shrouds were completely blocked with stringing. Easy to remove but easy to miss if you’re not looking for it so do check this as well.

 

Posted by: @ludodg

if you have to redo the test 15 times it doesn't seems to be a software-problem for me. Software is stupid simple. There must be an issue with hardware. As suggested earlier, my guess is, it's a burr somewhere.

I guess I'll have to start disassembling the fan shrouds as well.

disappointing, i can not deny.
ordering, having to wait TWO years for your printer, assembling with attention to details ... and it fails ate the FIRST test. 🙁 🙁 

Posted by: @ssill2

so after reflashing firmware and about 15 runs of the fan calibration, it worked! lol   totally a software problem.  I was all ready to start loosening and removing shrouds too.

 

 

Posted : 04/12/2023 11:02 pm
ssill2 liked
ssill2
(@ssill2)
Noble Member
RE: XL dual tool - print fan self test fails on both extruders

Interesting, I'll have to check my extruders then.  that would make a lot of sense if they had pinched the wires.

Posted : 04/12/2023 11:03 pm
ludodg
(@ludodg)
Estimable Member
RE: XL dual tool - print fan self test fails on both extruders

i just wonder, ... I disassembled the fan shrouds and could not find any interfering burrs ... maybe it's just the fan not being totally loose yet... bearing too greasy ...?

Posted : 04/12/2023 11:18 pm
CleverSquirrel
(@cleversquirrel)
Eminent Member
RE: XL dual tool - print fan self test fails on both extruders

Can you feel airflow when the test spins the fans up?

Posted : 04/12/2023 11:23 pm
ssill2
(@ssill2)
Noble Member
RE: XL dual tool - print fan self test fails on both extruders

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.

Posted : 04/12/2023 11:42 pm
CleverSquirrel
(@cleversquirrel)
Eminent Member
RE: XL dual tool - print fan self test fails on both extruders

Glad you found the issue!

Posted : 05/12/2023 6:49 am
ssill2 liked
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