I'm fairly new to 3D printing but I'm getting the steam up and I chug out pieces without much hassle. One thing though is that I have the impression that sometimes, parts are easily broken, and I suspect bad adhesion between layers.
I'm printing eSun PLA at 208°C (212°C first layer), bed at 50°C first layer then 30°.
When I print the Benchy boat, it feels extremely sturdy (even the small chimney is unbreakable by hand), but if I make, say, a 50mm diameter cylinder with 4mm wall thickness, It breaks fairly easy along some layer. I don't see any specific error, it "looks" okay.
So my question is:
How do you assure that you print layers that bond enough?
[Edit] I already know that might actually cause bad bonding (low heat, underextrusion, ...) but I'm looking for a way to see when it happens.
Here is an image from when I stopped mid print (you can see the little ooze string just at the start at the crack) for checking dimensions. The next layer didn't bond well because, I guess, the already printed part had cooled down when I un-paused the print (say 1 minute later) or maybe the z-axis went off a bit when I touched the build plate.
Is the only way of knowing layers bonded correctly, to try to break the part apart?
From my experience the most profound difference is in the material. Especially with eSun PLA that I have used over 10 spools I have found huge inconsistencies. In one spool the printing adhesion was fine on other spools it was very very bad. My first advise is try another branded filament, I would recomend Colorfabb, Polymaker and Formfutura for PLAs. Secondly if you want to use the eSUN try higher temperatures, go above 210 or even 220.