Thumb screws vibrating loose on Core One  

RE:

I didn't have both thumbscrews get loose but I did have one do that. It happened when I was still very new to the printer, tried to remove the nozzle without loosening the screws, and bent the tip of one of the screws. I had to order replacements. Unless you frequently remove nozzles maybe a small amount of blue Loctite? 

RE: Thumb screws vibrating loose on Core One

Thanks.  I might try that.  

Posted by: @hyiger

I didn't have both thumbscrews get loose but I did have one do that. It happened when I was still very new to the printer, tried to remove the nozzle without loosening the screws, and bent the tip of one of the screws. I had to order replacements. Unless you frequently remove nozzles maybe a small amount of blue Loctite? 

RE: Thumb screws vibrating loose on Core One

I do swap nozzles somewhat frequently and a while back noticed the hot-end had rotated a little and found it had loosened off and could easy be moved by hand. I've not had the nozzle fall out and/or scratch the bed so must have just caught it in the nick of time. Checking these thumbscrews has become part of my between-print checklist. 

TBH I'd never thought to ask if this was normal, a potential problem, or just another me-issue before seeing this thread

RE: Thumb screws vibrating loose on Core One

I wonder if you put a small "O" ring under the head, it may work like a lock washer due to the friction.  I have seen similar things done with other equipment.

RE: Thumb screws vibrating loose on Core One

I can imagine the lower one might cop a bit of heat. If the nextruder was long-term I might consider it, though checking those two thumbscrews when I clean the nozzle between prints isn't a hassle really

RE: Thumb screws vibrating loose on Core One

I have added this to my checklist also.  

Posted by: @geoff-steele

I do swap nozzles somewhat frequently and a while back noticed the hot-end had rotated a little and found it had loosened off and could easy be moved by hand. I've not had the nozzle fall out and/or scratch the bed so must have just caught it in the nick of time. Checking these thumbscrews has become part of my between-print checklist. 

TBH I'd never thought to ask if this was normal, a potential problem, or just another me-issue before seeing this thread

RE: Thumb screws vibrating loose on Core One

Interesting idea - thanks for the suggestion.  

Posted by: @robin_13

I wonder if you put a small "O" ring under the head, it may work like a lock washer due to the friction.  I have seen similar things done with other equipment.

RE: Thumb screws vibrating loose on Core One

I've had this happen twice when printing PA-CF, after some hours of use, with a 55C chamber. Both times the thumbscrews came loose and the nozzle dropped to the bed, and now both sides of my PP plate are damaged. I know they were tight the 2nd time, at least.

RE: Thumb screws vibrating loose on Core One

Just had this happen to me an hour ago. Wondered what the odd thumping sound was, went upstairs to check on the printer, and the heatblock and nozzle had slipped down, dug through the print, through the coating on a Biqu Cryogrip Pro and was having a good go at digging through the plate as well.

Oh well, that's why the sheets have two sides, I suppose 😀