Silicone Sock Woes, Strange Under Extrusion Issue, One Amazing MMU3
Sorry upfront for combining 3 topics but they all relate to each other.
I have three MK4S's printing Jessie PETG, and one MK4S which has the MMU3 it is also printing Jessie PETG and Polymkaer PETG and Just Maker PETG.
Starting with the silicone sock issue. I have never had so many burned pieces of filament falling down onto the prints. So much so that I'm inclined to take them off. Is anyone else encountering this? I even have burned PETG collecting on the sock itself which I need to clean occasionally.
Printer 3 is a MK4S and a couple spools of filament back started to under extrude, I know because it looks exactly like the under extrusion photos and I did the visual cube and it's under extruding. I measured my filament with cali[ers and found it around ~1.72mm and so increased the flow rate to 110-112%. This did lessen the amount of under extrusion but did not resolve the issuse. I finally moved the filament over to Printer 2 also a MK4S printed the same file and zero problems, which tells me that the problem lies with Printer 3 not the filament. I did do a couple cold pulls but nothing came of it. I just now used on of the kits included pokey tools and poked up the nozzle and am running a test now. Any thoughts or tests?
Now the good news, I have Printer 4 a MK4S with an MMU3 and it prints perfectly. No strings, no burned chunks falling, minimal lift off the bed after printing, literally perfect prints over and over. I'd love to know what the difference is between these two files linked below. I know the nozzle temperature is different but increasing the temp up to 260 does not solve the issues listed above.
Thanks very much in advance!
https://drive.google.com/drive/folders/1y-3G5MJvx236vXe6EypjpjMtVRynAX7g?usp=drive_link