Strong strings in printed shields
Hello,
I have problem with my Original Prusa i3 MK3S - I am printing this Prusa covid shields https://www.prusaprinters.org/prints/27267/files (4pcs) from PETG and in printing it makes somewhere strong strings. Sometimes it makes strings only on one shield and sometimes on 3 shields.
I tested this gcode several times on my printer and on other same Prusa i3 MK3S printer (filament from same manufacturer, same gcode), it makes this strong strings only on my printer.
It seems like that the printer doesn't follow shape of shield. It affect that outer band which is away from the wearer's skin and it doesn't look good.
Can somebody know, how can i fix it?
Thanks for help
RE: Strong strings in printed shields
Two things I would do to correct this....
1. Increase nozzle temperature 5C hotter to improve layer to layer adhesion.
2. Dry the filament roll
RE: Strong strings in printed shields
Agree with @guy-k2. Someone posted a similar question recently. I've got more notes in that thread.
and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan
RE: Strong strings in printed shields
@bobstro
@guy-k2
Thank you. I try increase nozzle temperature to 270°C
RE: Strong strings in printed shields
@tadeasekf
Please let us know if increasing the print temperature works. And how do you do that when the gcode is already built? Modify the gcode directly?
RE: Strong strings in printed shields
@orders
You can edit the gcode file using a text editor, not for the faint hearted. If you get it wrong or corrupt the gcode file, you could damage stuff.
The line of code you are looking for is
M104 S???
where ??? is the required extruder temperature in degrees centigrade.
You also need to check for,
M109 S???
and set the same temperature value, this commands causes the printer to wait for the extruder to reach the required temperature.
Hope this helps.
Cheers,Dave Jackson"Enthralled Nooby (not so much maybe, ~58 years old)... If 3d printers had been around 40 years ago... "
RE: Strong strings in printed shields
@david-j21
@orders
It's very simple:
1. Run gcode on 3D printer
2. Press button
3. Press 2nd option - something like tune (in Czech lang "Ladit")
4. Look for option "nozzle temp" or "temperature"
5. Press button and set new temperature
RE: Strong strings in printed shields
@tadeasekf
Perfect thank you!
RE: Strong strings in printed shields
BTW, do the manual temperature change AFTER layer 2.
RE: Strong strings in printed shields
I had this, it's a perimeter speed issue. I slowed down the "Perimeters", "Small Perimeters" and "External Perimeters" all down to 60mm/s and it fixed the issue! It will increase print time of 8 bands (2 stacks of 4) with 8 chin reinforcements to 16h.
Download the "covid19_rc32_8pcs_complete_fixed.3mf" file from here.... https://www.prusaprinters.org/prints/27267/files
Open the file in PrusaSlicer (I am using the latest 2.2.0), go to "Print Settings" tab, select "Speed" from the menu on the left. Adjust the settings above as described and then generate your new gcode.
Should work just fine after that.