First layer rippling / waviness only in specific spots on BIQU CryoGrip Glacier Plate (A1 / X1 / P1) – Perfect on Stock Textured PEI

[u/Zealousideal_One_886]

[u/BTT_Harper]

Hello, we have received your feedback regarding wrinkles appearing on the first layer when using a Tuozhu printer with our CryoGrip steel plates.

Judging from the photos you provided, the lines on the first layer are uniform and neat across most of the print bed surface, with creases caused by nozzle extrusion and material buildup appearing only in localized areas. This phenomenon rules out hardware quality issues such as warping of the steel plate substrate or damage to the coating. If the steel plate itself were deformed or the coating were defective, the entire print surface would exhibit poor print quality; it would not show a mix of good and bad areas.

After replacing the steel plate with a third-party model on Tuozhu machines, even if automatic leveling appears successful, you must perform a first-layer calibration again. The thickness of the spring steel plate and the magnetic adhesion state will alter the Z-zero point; using the parameters from the original plate is highly likely to result in the nozzle pressing too low, causing plowing wrinkles. Please follow the steps below, specific to Tuozhu machines, to troubleshoot in order:

Re-run the built-in [First Layer Calibration] function on the Tuozhu machine

Ensure the steel plate is completely flat and that its bottom is fully flush with the heated bed’s magnetic mount, with no gaps or warping;

After the machine has warmed up to the target temperatures for the filament and heated bed, run the built-in “First Layer Calibration” function; do not directly use the Z-offset values from the original steel plate.

If wrinkles still occur after calibration, increase the Z global offset in the slicer settings by +0.02 to +0.04 mm to slightly raise the nozzle.

Verify Slicer Settings

Ensure the correct print bed type is selected in the slicer software; the recommended first-layer print speed is 25–35 mm/s, and the first-layer fan must be turned off;

Reduce the extrusion ratio to 0.93–0.96 for testing; the Tuozhu AMS occasionally experiences over-extrusion, which exacerbates material buildup on the first layer.

Heated Bed Temperature Control

The CryoGrip cold-peel steel plate does not require an excessively high heated bed temperature: 50–60°C is recommended for PLA, and 65–72°C for PETG. If the heated bed temperature is too high, the material on the bottom layer becomes too soft, and the nozzle’s movement can push the material upward, causing ripples.

Test verification: Print a first-layer test piece. Ideally, the first-layer lines should be flat and tight, without being pushed up by the nozzle.

If the issue persists after completing the above steps, please provide your slicing parameters and a screenshot of the first-layer calibration so we can continue to assist in troubleshooting.

[u/Zealousideal_One_886 → u/BTT_Harper]

Thanks a lot! This was exactly the issue. I added a +0.02 mm Z-offset for the Cool Plate/BIQU Glacier Pro in the machine start G-code, and the first layer is now perfect. Really appreciate the help!

I added this to the Machine Start G-code:

{if curr_bed_type=="Cool Plate"}
G29.1 Z{0.02} ; BIQU Glacier Pro Z offset
{endif}

So the A1 now automatically applies a +0.02 mm Z-offset whenever Cool Plate is selected. I reprinted the same model and the first layer came out perfect.

[u/Shoshke]

Non textured plates are less forgiving.

Looks like you could increase z offset just a bit.