Ian has great advice - all those things help the part *stick* better. But there is another technique that instead reduces pulling forces.
Another technique is to do all that but instead RAISE the bed temp a little and keep the fan off (although 70C is usually plenty). This second technique keeps the bottom 10mm of PLA *above* the glass temperature so that it is soft and mushy and the pulling/shrinking stesses deform it a little but not enough to pull it off the bed. This second technique usually requires the fan to be *off*. However only use this second technique for large parts - parts that take more than 15 seconds to print a layer.
If the top layers of the part print less than 15 second you need to turn the fan back on at that point.
A third technique creates a heated chamber. This isn't usually necessary.
good morning :-)
first did you try using glue stick ?
then how much brim did you use... for me when i need to create large flat parts.. i use a lot of brim.... it really does help.
Also I think the standard temp for the heated bed is 70... bring that down to 50..
Also for the first 1 hour... print slower ! and also for me this works atleast... cooling fans on the print head 100%
Also make sure that your print bed is really setup perfectly... so when the print head moves around.. you get a nice squeezed a little pla flow... not just a string barely standing on the surface.. like a thick paint stroke.. then you should have a concrete base for your print !!
hope that helps !
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