Over extrusion?  

RE: Over extrusion?

Bobstro has a web site that will help you change your bed mesh leveling and heating cycles.  I don't bother.  I have a silicone squeegie square that I just clear the bed with before the print if I see that stuff.  Usually happens if you are too hot for the filament you're printing.

RE: Over extrusion?

I always start with a clean build plate. I notice the problem seems to happen while the nozzle is heating up in prep for printing a project. Maybe a retraction setting?

RE: Over extrusion?

A 2 step nozzle warmup procedure can help. You can update the Mk3 start gcode to do this. I've got some detailed notes here if you're interested. This procedure has the added advantage of warming the printer up before starting the first print of the day.

RE: Over extrusion?

I implemented different start g-code, @bobstro comprehensive guide is very good and worth looking at.  I do the bed levelling at 175c and also changed the wipe line to have an initial scribble, prints now start 100% reliably without any filament bits and I don't even having to look at whats going on.  Originally I also added a heat soak of the Pinda before bed levelling but I took this out as I didn't see a discernible difference and it delayed starting next prints while waiting for it to cool.

RE: Over extrusion?

@bobstro

OK, so I read the article. I would just replace the startup code in PRUSASlicer with the full string of code at the end of the article?

RE: Over extrusion?

Posted by: @jluvs2ride

[...] OK, so I read the article. I would just replace the startup code in PRUSASlicer with the full string of code at the end of the article?

Not necessarily all of it, but the parts you're interested in. You may not want to include the PINDA warmup stuff if you don't want it, but it also shouldn't hurt. It will add a delay at the start of the print while everything warms up, and it can take a few minutes on a cold day.

RE: Over extrusion?

@bobstro

I'm not usually in that big of a rush.

RE: Over extrusion?

Posted by: @jluvs2ride

@bobstro

I'm not usually in that big of a rush.

Give it a try and see if you like it. I prefer to let the printer warm up before the first print of the day, so even if it's not really required for PINDA v2 and newer, I use it. I've received requests to modify it to pre-heat the bed for leveling with the SuperPINDA and will update the pages for that soon.