REMEMBER TO TIGHTEN THE THUMBSCREWS for the hotend.
 
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REMEMBER TO TIGHTEN THE THUMBSCREWS for the hotend.  

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NickAtNight
(@nickatnight)
Reputable Member
REMEMBER TO TIGHTEN THE THUMBSCREWS for the hotend.

I was printing my second large GNOME.  

The Thumbscrews were not properly tightened. So the Hot End fell INTO the print after it was about 2" tall. 

The printer shut down and gave an 'overcurrent' error.

Once the print head was retrieved from the melted plastic, it recovered well.  

But it is probably a good practice to verify the thumb screws are tight on a regular basis.

Posted : 10/12/2025 3:44 pm
1 people liked
NickAtNight
(@nickatnight)
Reputable Member
Topic starter answered:
RE: REMEMBER TO TIGHTEN THE THUMBSCREWS for the hotend.

PRUSA Tech support were very helpful in figuring out what had gone wrong.

Came home expecting the print to be almost finished.  Instead the machine was beeping with a fatal 'overcurrent' error.

It turned out that all it was was the thumbscrews not being tight and the head having dropped into the piece mid print.

Posted by: @jeana769hadley

Hello!

 

Posted : 11/12/2025 5:34 pm
Jürgen
(@jurgen-7)
Noble Member
RE: REMEMBER TO TIGHTEN THE THUMBSCREWS for the hotend.

Don't bother with "Jeana", it's just a spammer. They post some stuff of limited relevance -- sometimes just regurgitating a prior post via AI, like in this case. Then they come back a couple of days later to add a spam link to their signature, to advertise whatever unrelated service. It's an attempt to get a better page rank on Google by having many links to the advertised sites. 

Luckily spammers are rarely seen in the printer-specific forum sections, but pretty common in the "General" top section. If you spot a post with the signature spam link added, please report it via the "Report" button. Joan does a great job cleaning these out.   

Posted : 11/12/2025 7:09 pm
2 people liked
hyiger
(@hyiger)
Noble Member
RE: REMEMBER TO TIGHTEN THE THUMBSCREWS for the hotend.

 

Posted by: @jurgen-7

Don't bother with "Jeana", it's just a spammer. They post some stuff of limited relevance -- sometimes just regurgitating a prior post via AI, like in this case. Then they come back a couple of days later to add a spam link to their signature, to advertise whatever unrelated service. It's an attempt to get a better page rank on Google by having many links to the advertised sites. 

Luckily spammers are rarely seen in the printer-specific forum sections, but pretty common in the "General" top section. If you spot a post with the signature spam link added, please report it via the "Report" button. Joan does a great job cleaning these out.   

It's interesting as well that they tend to share a similar pattern for the username. It's often <name><number><name>. 

Posted : 11/12/2025 9:45 pm
Jürgen
(@jurgen-7)
Noble Member
RE: REMEMBER TO TIGHTEN THE THUMBSCREWS for the hotend.
Posted by: @hyiger

 It's interesting as well that they tend to share a similar pattern for the username. It's often <name><number><name>. 

Yes, that pattern remains common, although far from universal. I was originally reluctant to discuss it in the open threads, to avoid tipping off the spammers about this telltale sign. But it does not seem to matter; they just blindly follow their standard approach. Maybe the whole spam workflow is largely automated by now?

Posted : 11/12/2025 9:51 pm
1 people liked
Photon
(@photon)
Member
RE: REMEMBER TO TIGHTEN THE THUMBSCREWS for the hotend.

I'd say you got off pretty lucky - back when I was still swapping nozzles with some regularity, I forgot to tighten the screws at all and realised it far too late. Watched in horror as the MMU loaded in some filament and the thermistor cable split in two pushing the nozzle away! Had to pick up a third party replacement to get printing ASAP, but it worked out fine until the official replacement arrived. Probably didn't help as well that I had accidentally made it the load bearing cable...

Posted : 12/12/2025 2:52 am
1 people liked
k1mu
 k1mu
(@k1mu)
Estimable Member
RE: REMEMBER TO TIGHTEN THE THUMBSCREWS for the hotend.

Agree. I had forgotten to tighten the screws enough before printing a fairly large object and watched the nozzle moving up and down in the nextruder while it was probing the bed. This left several divots in the print sheet.

Posted by: @photon

I'd say you got off pretty lucky

Posted : 15/12/2025 3:56 pm
1 people liked
hyiger
(@hyiger)
Noble Member
RE: REMEMBER TO TIGHTEN THE THUMBSCREWS for the hotend.

In 3 more months (I hope) I won't need to worry about thumbscrews anymore... The INDX system will take care of that. 

Posted : 15/12/2025 5:50 pm
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