UM3 degraded prints overtime on

[EVRC 1]

Hi everyone,

 

ive posted a few times about this issue that I’ve had with my UM3 and I’d really like to fix it now. After my printer has been printing a few prints and been on for awhile the printer starts doing weird things. The latest example is a 1/35 scale Jeep body with two filament colors. The first couple of prints were ok but I need to make some adjustment on supports. After that the printer started underextruding one color and overextending another. If I restart the printer it prints fine. Here is a pic of the start of a decent print and the second bad one. I restarted the printer after this and it’s currently printing another one. It’s looking ok for now. 

[Smithy 1,146]

Have you aborted a print job before?

I can remember there was a bug in an older firmware that after aborting a job, the printer does sometimes wired things. 
 

Do you have the latest firmware installed?

 

Do you get the underextrsion all the time or just in the first layers?

[EVRC 1]

I’ll double check but I do believe I’m on the latest firmware. I have recently aborted a print. The underextrusion will be random when it happens. It was strange how there’d be underextrusion then noodles on the back of the model. 

Edited August 3, 2020 by EVRC

[Smithy 1,146]

Have you tried different print cores?

[EVRC 1]

I have a number of different cores. I’ll switch them out and see if it’s there is any change. 

[Smithy 1,146]

It could be that one print core is partly clogged and with a change you can quickly check this. If it is working with another one, you can switch back and do some hot/cold pulls to clean the nozzle. Especially if you print with different materials it could happen that some residues remains in the nozzle.

[EVRC 1]

I just cleaned both cores and did a fresh restart. We’ll see how it turns out tomorrow 

[Smithy 1,146]

I keep my fingers crossed 🤞

[EVRC 1]

Well it finished without the major defects. I think we have another issue. It’s warping and drooping. Everywhere. You think my fans my not be working?

[Smithy 1,146]

Looks funny, sorry 😀

But I have no idea how this can happen. Do you print too hot? Or yes maybe the fans are not working.