Issues with PLA layer adhesion

[NoBrand]

what brand of pla are you using and what temps and speeds are you using ? Got to admit pla layer adhesion is not something i've ever really had issues with. Under extrusion would be the only thing that comes to mind. what slicer are you using ? And what is your extrusion ratio and extruded bead size set to ? The extruded size is NOT the same as the nozzle size. And - in my experience - slicers have a tendency to massively overestimate the extruded width. On a 0.4 mm nozzle most slicers want to set the extrusion width to around 0.5. I've measuired my extrusions widths and use those settings. My delta with the 0.5mm nozzle runs at 0.52 and the other printers with 0.4mm nozzles are both currently set at 0.4 So that's worth checking. If you don't yet have aet of digital calipers - get one :-) Abs expandsa lot more than pla - so the extrusion width is always going to be larger, which might account for why abs works better than pla.

Like I mentioned, I'm fairly new at this but I'll do my best to answer:

Brand pla: various, but mostly a brand named "printox".

Temps: varies. But mostly following the pla recommendation on the spool. I have tried also print 5-10 C over the recommended settings with little improvement, if any.

Speed: I'm guessing that's nozzle travel? Generally, I follow the recommended settings in the slicer program. I think it's 100% IIRC.

Slicer: Cura 4.8.0 Ratio, not sure what that is.

Bead size: I assume that's the layer height? if yes, I generally set layer height roughly 50-75% of the nozzle size with some variation up/down around those percentages.

Digital calipers: one of my other hobbies is machinist, so I've got measuring tools pretty much covered.

Here's a pic of my current printer and enclosure:


Thrown together with some leftover scraps. That's why the plexi has holes in it. Plexi is expensive these days of covid!

What it mostly does is just make it a little easier to keep the temps stable as well as keep drafts off it while printing.

Cheers

Edit: not sure why the forum keeps bunching up my sentences into one long paragraph. Tried to fix it, but it keeps getting smooshed into one block. Apologies to anyone having trouble reading it.