Nozzle change 0.4->0.6 print issue  

RE: Nozzle change 0.4->0.6 print issue

A few notes:

The filament doesn't seem to be feeding smoothly. If you raise Z and extrude into free air, the filament should flow smoothly and coil neatly underneath. If it cants to one side after a few moments, it can indicate a partial blockage. That odd pattern looks more like an issue with the filament or feed. Is there any chance the filament has been exposed to moisture? Did the same spool work with the 0.4mm nozzle? Can you try another spool.

The current on-board Live-Z procedure is designed for a 0.4mm nozzle. It may be tough to get good results with a larger nozzle. Easiest is just print any square-ish STL (the Prusa logo works) and examine the first layer. When your Live-Z is right, lines should go down smoothly and not be dislodged with a gentle poke. I'd recommend you start the print high (Live-Z less negative) and work down until it starts to stick, then continue down (more negative) slowly until the lines flatten out a bit and stick well. Then continue fine adjustments down until you get an even surface. (This is essentially the approach use by in Jeff Jordan's "Life Adjust" procedure simplified for a simpler nozzle.)

I've got some notes and sample test prints for a variety of materials and nozzle sizes here that you might find useful.

RE: Nozzle change 0.4->0.6 print issue

@bobstro

Thank you for your support. If it is partially blocked, how can I unblock it ? The filament was printing fine a few weeks ago with 0.4 nozzle. I will try with another spool of filnament.

RE: Nozzle change 0.4->0.6 print issue

Check if gears inside are sitting good and not release on 1 side.

Adjust spring, see manual, then try to tension a little harder in a few steps.

Try to print with higher temps and slower, you are pushing more filament (0.6mm), it needs more time or more heat, to melt.

Your first layer calibration, I see a corner not square , square at the end has gabs, normally it means to high, or not enough filament.

Clean bed with dish soap(no alcohol) and set first layer as good as possible.

RE: Nozzle change 0.4->0.6 print issue

Posted by: @borys-gornicki

[...] Thank you for your support. If it is partially blocked, how can I unblock it ? The filament was printing fine a few weeks ago with 0.4 nozzle. I will try with another spool of filnament.

It's well worth reading up on doing cold pulls. Prusa has an article written for the Mk2 that generally works for other printers. 

I like to use cleaning filament since it will work at temperatures high enough to melt out higher-temp filaments like nylon & PETG, but also flow at lower temps so if a bit gets left behind, it will flow out when you print lower-temp filaments like PLA, thus avoiding a blockage.

The idea is that you melt some filament in the hotend, let it cool so it traps any gunk inside too big to extrude through the nozzle, then warm the filament up and pull firmly up as it softens to lift the crud out.