Greetings all! I’m using a Creality Ender 3 with PLA filament. My broad, flat prints are bending up at the corners, off of the print surface. I’m using glue stick, which normally solved the problem in the past, but not working now. I’m printing with a nozzle temp of 200C and a bed temp of 80C. To help the corners stick to the bed, should I increase or decrease temperatures? Other fixes? Thanks!
80 is probably too high for PLA. Typically, I print at 60 on the bed temp.
Does your filament suggest 80 for the bed temp? Do you have an enclosure? Open air printers are more susceptible to outside temperature issues.
Do you have a metal build plate or that spongy black magnetic plate? My S9+ had the spongy stuff and after a year nothing would stick. I bought a metal build plate and never had a problem since.
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If its the corners lifting it sounds like the print is shrinking and warping. PLA is usually not a problem but PETG and ABS are bad for this. If the design has long straight edges you will probably get more lifting at corners. Often this is due to your cooling fans so adjusting the cooling may help. The other options include altering the design is possible or adding anti warping tabs. Cura has a few add-ons that can help.
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Other things to try:
Clean your build plate. I wipe mine down with rubbing alcohol before every print.
Manually level the bed. I also print a lot of flat, sheet-like parts, and have found that many adhesion problems can be due to the levelling being off, so manually level the bed when you notice problems. I also use a Creality CR Touch sensor on my Ender 3 Pro and have added the G29 bed levelling code to my start G-code so it runs the levelling routine for every print. That might be overkill, but I do it.
Consider adding a second Z-axis drive. I added a second Z-axis leadscrew to my Ender 3 Pro and this dramatically improved the quality of all of my prints. I was watching a print run one time and was shocked to see how much the gantry droops when the print head moves to the unsupported side. Many of my models are essentially open boxes – the walls of a building – without a top or bottom, with the walls being about 4mm thick. I was having problems with elephant’s foot where the print adhered, and lifting corners which caused the bottom of the walls to curl. Brims and adhesives did not address things. Adding the second Z-axis leadscrew to support the gantry made a huge difference.
Slow the first layer speed. Sometimes slowing the speed of the first layer can help adhesion, but I don’t use that very often. Usually cleaning the build plate and confirming the levelling addresses adhesion issues before I’m tempted to slow down the first layer.
Hope this helps.
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