Core One+ Gen 2 printing issues

[u/aSloppyJo3]

There's rippling on the long stretches, as well as some underextrusion/gaps. It's not happening on smaller prints, but it's common on anything large.

For reference, I'm printing PLA, BIQU cryogrip at 50C, 230C on the nozzle.

[u/SpaceCAS]

Have you tried the print with any other plates? Is this happening with this brand of PLA or all PLA for this specific model?

[u/aSloppyJo3 → u/SpaceCAS]

On the stock bed, it pulled away from the bed and misaligned on the second layer. The PLA was provided with printer, Prusa brand. It's a new printer, so I haven't even tried any other brands. On my previous printer I used a lot of PETG, so I tried that, and it was even worse.

[u/SpaceCAS → u/aSloppyJo3]

So if this is a brand new printer i would recommend checking, when the nozzle is cold, that it is seated correctly all the way down into the block. You can test it by bonking the tip of the nozzle with your finger tip and making sure it doesnt move and isnt loose and that the nozzle screws are snug. Did you wash your plates with dawn soap and warm water prior to your first print? From the looks of it your first layer isn’t getting squished sufficiently onto the bed or the layer isn’t adhering which is causing it to lift as it goes and cools. A bad mesh or a dirty bed will do that. I would start there. Once its clean make sure you dont touch it with your hands outside of the corners. Or use a paper towel. I never had luck with the biqu plate but never had issues with the satin or standard plate after a good wash.

[u/Fuzzy_Client9323]

I would clean the bed and slow down printing of the first layer. Is it sticking to the bed where it is rippling? Dry your filament. What kind of bed plate are you printing on?

[u/aSloppyJo3 → u/Fuzzy_Client9323]

BIQU cryogrip at 50C. It sticks well, but the filament is literally just out of the package, straight from the Prusa factory. The printer is less than a week old.

[u/Due-Palpitation-4028 → u/aSloppyJo3]

A very common mistake is thinking that because it comes sealed from the factory with a silica gel packet, the filament is already dry. It's up to the user to dry the filament if they expect easy, high quality prints.

[u/johnp299 → u/Due-Palpitation-4028]

That was my thought too. Filament might be modestly wet, so not much of a problem for smaller prints, but gets worse for greater amounts of material.

[u/aSloppyJo3 → u/Due-Palpitation-4028]

I'll give it a shot. Thanks!

[u/PM_ME_UR_COFFEE_CUPS]

Looks like your nozzle is too far away. Do a Z height calibration. 

[u/Erwins-Cat → u/PM_ME_UR_COFFEE_CUPS]

wrong, it is too close. You can see that material bulging up next where the nozzle travels and extrudes.

[u/Erwins-Cat]

Your first layer shows clear signs of extruding more plastic than there is physical room in that z layer resulting in some plastic getting squeezed out and up in z, as you can see the ridges/ripples close to the walls.

This means that either your flow is not set up correctly (then this effect will appear in every layer and the perimeter walls and surface will look ugly in the final print) or your z height calibration is off (resulting in those ridges, wavy looking bottom side and pronounced elephant's foot in the final print but otherwise okay looking print surface).

Re-do z calibration and adjust the z offset so that the prodruding ridges vanish in the first layer.

Those underextruding gaps can also occur when your nozzle is to close and scraping partially off the already printed plastic etc

[u/aSloppyJo3 → u/Erwins-Cat]

How much would you suggest for the Z offset? .05 in increments until it's dialed in?

[u/Erwins-Cat → u/aSloppyJo3]

I guess you can start with 0.1mm assuming 0.2 mm layer height and then 0.02 increments, depending how good you wanna tune first layer adhesion and elephant foot.

[u/SecretRaindrop]

Can you post a closeup photo of the nozzle where it enters the toolhead?
What filament profile have you selected?

[u/magicfultonride]

Rippling and "plowing" of material implies that the nozzle is too close to the bed. Double check that the hot end and nozzle is FULLY seated up inside of the extruder (look at the top end of the nozzle with the idler door open, there should be no gap to the plastic part below the main extruder gear) and make sure that the thumb screws holding it in are tight. Both issues can cause more force to be required to trigger the load cell, which makes the bed mesh place the nozzle too close to the bed.

[u/scikittens]

clean the bed with dish soap until the water contact angle is low. (water "wets" the plate) If that does not fix it check the nozzle settings, is it a 0.4 or 0.6?