FLSUN T1 Pro/Max setup: Update certificates to enable SimplyPrint support

Some FLSUN T1 Pro/Max printers ship with outdated SSL certificates, which may prevent SimplyPrint from connecting properly.

To fix this, you just need to run a quick command on your printer via SSH.

Step 1 – Connect to your printer via SSH

New to SSH? Check out our setup guide on what it is and how to use it; SSH: What is it and how to use it

1. Find your printer’s IP address (usually shown on the printer’s screen).
2. Open a terminal:

• Windows → Command Prompt
• Mac → Terminal

3. Enter the following command, replacing [ip-address] with your printer’s IP:

   ssh pi@[ip-address]

Example;

ssh pi@192.168.1.25

4. When prompted for a password, enter:

1

(yes, the password is just "1" by default)

(it won’t show as you type, just press ENTER)

Step 2 – Run the certificate update fix

Once connected to your printer, paste this one-liner and press ENTER:

wget -qO- https://download.simplyprint.io/flsun/flsun-ssl.sh | sudo bash

This is a small script made by us to update the certificates to allow your printer to connect to our servers.

Step 3 – Verify success

If no errors are shown when running the command, the update worked.

You can now try connecting SimplyPrint again via the Klipper setup guide; https://simplyprint.io/setup-guide#klipper:1

✅ That’s it — your FLSUN T1 Pro/Max should now be able to connect to SimplyPrint.

Updated on: 10/09/2025