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First layer issues


jgill
(@jgill)
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Joined: 1 year ago
Posts: 8
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Hi, I'm trying to print the popular "XYZ 20mm Calibration Cube" (screenshots below) and I keep getting this issue right at the beginning of the print that I'm not sure if it's due to under extrusion, bad adherence, etc.

The first attempt was with Cura default settings with layer height of 0.12mm and plate temperature 60º and extruder temperature 210º with filament Sunlu PLA+.

The second attempt was increasing temperatures to 65º/215º and increasing the initial layer height from 0.12 to 0.2mm.

I have no clue why the issue happens in the same area in both attempts. I have leveled the bed with the usual paper sheet method and there are no differences within the printed area.

Could anyone give me an opinion on what the issue might be?

Thanks!

Attempt 1: https://photos.app.goo.gl/V6GdooaNyzkjji88A

Attempt 2: https://photos.app.goo.gl/BW6Fkb8tHogYjSE3A

The cube I'm trying to print: https://photos.app.goo.gl/hRpFzzdLZmMz1UFC6

 


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jgill
(@jgill)
Active Member Registered
Joined: 1 year ago
Posts: 8
Topic starter  

Answering myself, I tested the extrusion calibration and it was way off. I had to increase the Transmission ratio E from the default 93 to 108.

It still doesn't print perfectly but it looks much better.


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tosio3D
(@tosio3d)
Eminent Member Registered
Joined: 1 year ago
Posts: 26
 

Hi @jgill, for a good first layer bed leveling is the clue (seek for a good manual mesh bed leveling Firmware, but read enough before installation of the FW, there is also a good source here within this forum, important is to know what kind of hardware you have in your ender 3V2). In Cura you can play with the fan and velocity settings for the first layer (velocity first layer normally 10...20mm/s) fan speed from 0 to max depending on your material...when I print small samples I clean the bed with Isoprop and use 3DLAC if adhesion issue remain....however, if fan speed is too slow and bed temp is too high "elephant foot" issue can occur... 


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