Black Line passant au milieu de mes impressions Sprocket

@ViviC
 
Welcome to HP forums, I see that you are getting print quality issues while printing on HP sprocket.
 
Upgrade the Sprocket firmware.

Make sure the Sprocket is on and your mobile device is connected to the Internet.

On your mobile device, open the HP sprocket app.

Tap the Menu icon , and then tap sprocket.

Tap Manage Printers, make sure your Sprocket is selected, and then tap Printer Settings.

Under the Status section, locate Battery.

If the battery charge is 25% or higher, continue with these steps.

If the battery charge is 24% or lower, charge the battery for at least 30 minutes, and then continue with these steps.

In Printer Settings, look for a firmware upgrade.

If a firmware upgrade displays, tap Get Firmware Upgrade, and then follow the on-screen prompts to complete the update.

If a firmware upgrade option does not display, the firmware is up-to-date.

Clean the Sprocket paper path rollers.

Remove the paper cover, and then remove any photo paper from the input tray.

Check the photo paper and remove any severely bent, wrinkled, or torn photo paper from the stack.

Reload the photo paper with the colored card on the bottom of the stack with the barcode facing down.

Replace the paper cover, and then send a print job.

You can refer to this HP document for more assistance:- Click here
 
Let me know how it goes.
To thank me for my efforts to help you, please mark my post as an accepted solution so that it benefits several others.
Cheers.