Printing .25mm
I am having issues with printing at .25mm. Prusa says I need to do a 7x7 matrix callibration under settings. There is only a 3x3 mesh. I really need a tutorial that I can not seem to find by googling. I cleared the clog but I cann't find any material that can help at this level. Is there any thing that prusa puts out for this task. I also need a pic of z calibration at this level. I get the snake pattern but I don't know what to look for.
RE: Printing .25mm
What printer and firmware version ? You need 3.7 or higher for 7x7 mesh leveling.
And the snake pattern in the firmware isn't best for Live-Z calibration. Use a larger piece so you have time to makes adjustments and see the results of the changes you make.
I use these:
And I try for a solid sheet of plastic that peels up like masking tape.
RE: Printing .25mm
@tim-m30
Thanks for the cal circles I will try. I use 3.8 the current version. I still cannnot see 7x7 bed leveling on the mesh bedlevel setting. I am looking for a tutorial on this. Surly I can't be the first to try this.
Regards
RE: Printing .25mm
Search using Google - Prusa has blogs, but they are well hidden and I can't find them unless I search. As for a 0.25 mm specific blog? No clue. Start with the 0.25 standard profiles; they print rather well without tweaking. Then adjust as needed for the filament you are using.
The 7x7 is there; so you're probably not looking in the right place. And if I recall, it is a toggle, not a selection: click on the value when it says 3x3 and it changes to 7x7. It is in settings or calibration; not both (and sorry, been to long since I set mine so I can't remember). You can also set it using custom gcode: G80 N7 R5 is the command I use (stock is just G80).
Also - Bob (@bobstro) has a web site dedicated to printing, and has some of his thoughts on 0.25 nozzles. You might try there.
RE: Printing .25mm
The major things to change when you use a new nozzle size are nozzle diameter, layer height and extrusion width. More notes here.
Recalibrate Live-Z after hardware changes like a nozzle swap, and PID tuning might be a good idea.