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Print misalignment after filament runout - do you have it or not? Poll is created on Mar 03, 2022

  
  
  

Print misalignment after filament runout  

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Colin
(@colin)
New Member
Print misalignment after filament runout

Hey all,

I wanted to share this and see how widespread an issue it is. I have a small print farm (currently 15 MINI+ and 1 MK3S) and have discovered something really disheartening that I haven't been able to figure out. On ALL of our MINIs, if the filament runs out, the print never quite lines up after the filament change. This is to the point that we can't rely on the printer to successfully pick up where it left off anymore, as the resulting parts are noticeably out of alignment to the point that I can't sell them.

So my question to all of you is: have you discovered this problem? I'm pretty sure you'd see this if you were to try. I want to talk to Prusa about it but we've just had no time to think about it... instead we have to weigh our filament spools and use as much of a roll as possible. The MK3S doesn't have this problem, so we're constantly printing partial rolls on the MK3 to use up the last bits of each roll. Really, really labor intensive.

If you do have this issue, have you tried to fix it? Have you had success? Thanks for any insight you might have!

Posted : 03/03/2022 5:15 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Print misalignment after filament runout

the Mini and the mk3 all use sensorless homing, 
If there is any friction on the X or Y axis you can get erratic homing
Have you lubricated the smooth rods and bearings recently?

regards Joan

 

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 03/03/2022 5:25 pm
Colin
(@colin)
New Member
Topic starter answered:
RE: Print misalignment after filament runout

Do you usually lubricate the axes after receiving your brand new printer from the factory? This is a persistent issue for us whether it's a brand new printer that's just been assembled all the way to our oldest MINI which is nearly a year old.

Posted by: @joantabb

the Mini and the mk3 all use sensorless homing, 
If there is any friction on the X or Y axis you can get erratic homing
Have you lubricated the smooth rods and bearings recently?

regards Joan

 

 

Posted : 03/03/2022 6:22 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Print misalignment after filament runout

I always lube my linear bearings during the assembly process. 

I know the guide says you don't have to... but it does not say, you must not lube... so I do what makes me feel better... I lube the linear bearings. 
I have used three different types of low viscosity grease and also precision light machine oil, on different printers, and they all run fine!

your beliefs and preferences may differ....

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 03/03/2022 9:28 pm
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