Desperate for 3D printing help!

[caddad]

Desperate for help as no matter what I do, I can’t get a good print.

Machine specs:

• 2.0 A350

• Original single extruder

• Original XYZ rails

• Latest firmware and Luban versions

• New hot end, 0.4 nozzle, and fresh filament

• Official quick swap system installed

Here’s what I have done so far:

• Extruder calibration

• New support platform and print sheet (with masking tape and aquanaut for adhesion help). I checked all bolts/screws and everything is snug.

• ABS support blocks on linear guide rails (https://www.printables.com/…/1109376-linear-rail-guide…)

• ABS Z axis brace (SnapMaker 2.0 Z-Axis Roller Brace (For CNC Stiffening) by ETechLabs - Thingiverse)

Issues:

• Z issues and shown in these images.

• Every XY calibration (using new 5x5 point system) results in failure to adhere to the front of the bed and often in the back right corner (nearest the controller).

I have never been able to print full bed and have mostly switched to my Bambu printers, but I want this expensive device to work, especially so I can print big!

Any help is much appreciated!!

[xchrisd]

I think your filament has too much counterforce which causes underextrusion.
Or your filament got tangled.

Be sure that your extruder has as less counterforce for feeding as possible.

Observing the print every now and then could be the clue.

Here something to read:

How to do a larger than 3 x 3 matrix level

So here’s my attempt at doing a leveling matrix larger than 3 x 3. Please be advised that this is not for the faint of heart. If you mess up this process you can bury your nozzle into your print surface. I know, I did. I’ll try and tell you how to avoid that. If you aren’t having any trouble with the first layer of printing then this process isn’t for you. I am doing this on an A250, so you may have to change some things for your size Snapmaker. The controller has a version of leveling that the…

[clewis]

@xchrisd

I think your filament has too much counterforce which causes underextrusion.
Or your filament got tangled.

When this happens to me, there’s a bunch of filament dust inside the print head. The feeder gear turns but the filament doesn’t move. A little compressed air should clear it out (and make a big mess).

It’s almost always because I let go of the filament end without securing it properly, and it tangled.

[Edit to add] I can also usually hear the filament “clicking”. It binds up, then releases suddenly, causing the filament to loosen and contract on the spool. I find that it helps to keep an ear open while a print is going.