I can see the importance of ensuring smooth check printing on your part, Hwmfuwaa. Don't worry, I'll provide alternative methods to print checks.

First off, let's make sure you mark all the bill transactions as paid. Once marked as paid, we can go to the Expenses tab, select the transactions, and open them. Then, it will route you to Bill Payment # to print. Click on Print check. Then, we can Preview and print the transactions, and Print it.

See these screenshots below:

An additional option is to navigate to the +New icon and choose the Print checks option. From there, you can select the desired transaction and make sure to select the correct account. Once finished, click on Preview and print. Then, proceed to print.

For more detailed steps, you can check these articles: 

• Bill payments or checks are missing from the print queue in QuickBooks Online 
• Print a check in QuickBooks Online

Additionally, I've also added this article to help you set up your print settings correctly: Configure your print settings for printing checks in QuickBooks Online. 

You can always come back to the Community if you have additional questions about printing checks. We'll be willing to lend a hand. Have a great day.