Offline 3D printing: running a printer without the cloud

Offline 3D printing means running a 3D printer with no internet connection and no maker account, which almost every desktop printer supports. You slice on a computer, then print from a memory card or USB drive, or send the job across your own network to the printer. The cloud adds phone apps, remote control from outside your home, model stores and cloud slicing.

Facts below come from each maker’s own documentation as of November 7, 2026. Features change with firmware and app versions, so check what your printer runs.

Do 3D printers need the cloud to work?

No. A desktop 3D printer prints a file from a memory card or USB drive with no network, and most networked models also take jobs over your local network with no internet. The cloud is needed only for features that run on the maker’s servers: phone apps, printing from outside your home, model stores and cloud slicing.

There are three ways to run a printer, from most to least isolated:

• No network. Copy the sliced file to the printer’s memory card or USB drive and start it on the printer’s screen. Bambu Lab says card printing “bypasses the cloud server”. Prusa says its printers’ Wi-Fi module can be left disconnected.
• Local network only. The slicer sends the job across your network, and you watch it in the slicer or a browser. The local route is LAN Only mode on Bambu Lab printers, PrusaLink on Prusa printers and Mainsail or Fluidd on Klipper printers. Bambu Lab LAN-only mode and PrusaLink setup have the steps.
• Cloud. The printer logs in to the maker’s servers, which pass jobs, camera video and status to a phone app or browser anywhere.

Slicers also work offline. Bambu Lab’s quick start guide calls logging in to Bambu Studio “optional, but strongly recommended”, and OrcaSlicer’s Stealth Mode “disables all cloud features”. Bambu Studio offline covers the one Bambu Studio download that needs internet.

Which 3D printers work without a cloud account?

All the major brands’ current printers print without a cloud account, from a memory card or USB drive, and each also has a local network route. Anycubic, Bambu Lab, Flashforge, QIDI and the Elegoo Centauri Carbon 2 have a LAN-only switch; Prusa has PrusaLink. Every maker’s own phone app needs its cloud.

Sorted by brand, from each maker’s documentation:

Where a local route still involves the cloud

• Local mode often switches the cloud off. Turning on the LAN-only setting disconnects the cloud on Anycubic, Flashforge, QIDI and Centauri Carbon 2 printers. The phone app stops working in that mode.
• Anycubic has no documented offline update. To update, its guide says to turn LAN Mode off and bind the printer to an account.
• Creality Print 7.0 and later sends over LAN first. If that fails, it “will automatically switch to the WAN channel” (wide area network), which means the cloud.
• Some local routes still ask for a login. Anycubic’s Kobra X guide starts LAN setup by logging in, unlike the Kobra S1 guide’s method “without an account”. Flashforge calls an account login “a prerequisite for … printer control” in Flash Studio Desktop and does not say whether LAN Only Mode needs the login.

For a Bambu Lab printer, every feature by mode is in LAN mode vs cloud mode; for a Prusa, in PrusaLink vs Prusa Connect.

Why do 3D printers need cloud accounts?

They need one only for features that run on the maker’s servers. The account ties the printer to those servers. They relay files, commands and camera video to a phone app anywhere, with no port opened on your router. The same servers run model stores, cloud slicing, print history and multi-printer dashboards.

What the cloud provides, as the makers describe it:

• Remote access and phone apps. Bambu Lab says Bambu Handy “must use the Internet to connect to the printer”. Prusa calls Prusa Connect “a cloud service, available from anywhere”, while PrusaLink is “accessible only within your local network”.
• A safe way in from outside. Opening a router port to the printer is the alternative, and the risky one. Prusa says “it is not recommended to access the printer from the internet over a port forward on the router” and to “use an encrypted VPN” instead. A guide on OctoPrint’s site calls putting OctoPrint on the public internet “a terrible idea”, because it controls the printer’s heaters and motors. Mainsail’s documentation likewise asks Klipper users not to open its ports to the internet. A VPN (virtual private network) into your home network is the local way to reach a printer from away.
• Cloud printing and history. In Bambu Lab’s default mode, a print file can travel through the cloud for the printer to download, and the cloud copy is kept up to 90 days for reprints. Prusa Connect includes 1 GB of storage “for G-codes and telemetry”.
• Model stores and cloud slicing. MakerWorld’s one-step printing in Bambu Handy slices the model in Bambu Lab’s cloud.
• Firmware delivery. A cloud-connected printer is offered updates. Anycubic documents updates only for a printer bound to an account.
• Print farms. Prusa says Prusa Connect “allows control of entire print farms, while tracking each printer separately”.
• AI failure detection. On the Bambu Lab X1, spaghetti detection runs on the printer, but in LAN mode it relies on the model in the installed firmware. Anycubic’s LAN guide says its AI detection cannot be enabled in LAN mode. Obico, a community open-source project, runs AI failure detection on a server you host yourself.

What are the risks of a cloud-connected printer?

The makers’ own records show four:

• Outages. Bambu Lab’s status page lists cloud printing outages, including one on September 24, 2025 that ran about 14 hours. Bambu Lab cloud down covers what keeps working.
• Data leaving your network. Identifiers, status and print files go to the maker, as the policies in the next section list.
• Rule changes by firmware. Bambu Lab’s January 2025 authorization firmware changed which software may start a print, in cloud mode and standard LAN mode alike. The firmware controversy covers what changed.
• Services ending. MakerBot retired CloudPrint in December 2025, and QIDI is replacing its QIDI Link app, as the cases below show.

What data does a cloud-connected 3D printer send?

A cloud-connected printer sends the maker its serial number and IP address plus firmware, status and diagnostic data. Print through the cloud and the print file and print history go too, with camera images on some services. Bambu Lab says its LAN Only mode keeps print data on your own network.

What each maker’s policy lists, sorted by maker:

Bambu Lab’s notice adds that it may use personal data and user content to improve the machine learning models behind its AI features. Its white paper says anonymized usage data goes to its User Experience Program, which you switch off on the printer under Settings > Device & SN > User Experience Program. Creality’s Creality Print policy (July 10, 2026) says uploaded model files and photos are not used for AI training without your explicit consent. Elegoo’s privacy agreement (September 18, 2026) says it “will not actively access or store any copies of camera images or videos”.

Bambu Lab’s privacy notice says that in LAN Only mode “all the printing task-related data stays within your local area network”, and its white paper says the printer “will not initiate any external connections”. Klipper’s Mainsail and Fluidd web pages send nothing out either. Mainsail lists no telemetry, and Fluidd says “no data leaves your network”.

How to block printer telemetry at the router

Turn on the printer’s local mode first. Then block the printer’s internet access at your router while keeping your computer’s path to it open.

1. Switch to the local mode. LAN Only mode on a Bambu Lab printer, or PrusaLink with Prusa Connect off on a Prusa. Prusa warns that “any software option is essentially just a promise” and offers leaving the Wi-Fi module unconnected.
2. Give the printer a fixed address. In your router, reserve an IP address for the printer’s MAC address (its hardware ID), as Prusa suggests. A firewall rule then keeps matching the printer.
3. Block its internet access. Add a router firewall rule that stops that address reaching the internet, or move the printer to a separate network. The NSA’s home network guidance says your wireless network should at a minimum be “segmented between your primary Wi-Fi, guest Wi-Fi, and IoT network”, where IoT (Internet of Things) means smart devices such as a networked printer. Bambu Lab says you can block its cloud domains “in your router’s firewall when you don’t need the related features”.
4. Keep local traffic open. Bambu Lab warns that some guest networks block the computer from reaching the printer, and that a printer on another VLAN (a separate virtual network) or subnet must be added by IP address and access code. The ports to allow are in Bambu Lab LAN mode not working.
5. Decide on time sync. Bambu Lab’s port list includes NTP (Network Time Protocol) time sync on port 123 for LAN mode, though the same page says its domain list “can be ignored” in LAN mode. Prusa says that fully offline, you set the date and time on the printer by hand.

A printer cut off this way no longer sees new firmware, so update it from a memory card or USB drive: see Bambu Lab offline firmware updates.

What happens to your printer if the company shuts down?

Anything that runs on the printer keeps working: printing from a memory card or USB drive, and local network control such as LAN Only mode or PrusaLink. Anything that runs on the maker’s servers would stop: the phone app, remote and cloud printing, the model store, print history and online firmware updates.

A cloud outage shows the split: during one, a Bambu Lab printer keeps printing from a card and in LAN Only mode while Bambu Handy and cloud printing stop.

What the makers and projects have committed to:

• Bambu Lab. Asked by The Verge in January 2025 whether its printers would stay controllable over LAN with no account or internet, Bambu Lab answered “For current models: Yes”. For future products it said “committing to a specific technical approach indefinitely is not responsible”.
• Prusa. Prusa wrote in April 2026 that it develops “all of our printers and services as offline-first”, and that “you don’t ever have to connect your printer to the internet, not even once”. Its printer firmware source is published under the GNU General Public License (GPL) v3.
• Klipper printers. Klipper, Moonraker, Mainsail and Fluidd are open source under the GPL v3. Mainsail says it was “designed to only run in your browser locally”, so none of it depends on a maker’s servers.
• Slicers. Bambu Studio, PrusaSlicer and OrcaSlicer are open source under the AGPL v3, the GPL’s network-service variant. Bambu Lab’s network plug-in is the exception: it is “based on non-free libraries”, and without it Bambu Studio prints “through the SD card”.

When a printer cloud or app has ended before

• New Matter, 2018. 3DPrint.com reported that MOD-t printers would lose their Wi-Fi functionality but “still be able to print via USB and the MOD-t desktop app”.
• Formlabs Form 1+. After support ended, Formlabs says “later versions of Firmware or PreForm are not compatible with the Form 1+”, so owners stay on the last compatible software.
• MakerBot CloudPrint, December 2025. MakerBot shut the service down and recommends “MakerBot Print for slicing and printer management” for printers its replacement does not support.
• QIDI Link. QIDI’s notice says the QIDI Link app “will be discontinued on November 5”, without giving a year. Current models move to its QIDI Maker app, and “older models are not compatible with official cloud services”.
• Snapmaker, October 2026. When it ended the Snapmaker 2.0, J1/J1s and Ray lines, Snapmaker said “your machine will keep working”. Critical firmware fixes continue until October 29, 2029.

To be ready, keep copies of the slicer installer, the printer’s current firmware file and your sliced files. A Bambu Lab printer used over LAN also needs the network plug-in, which Bambu Studio offline shows how to install from a saved copy.

Cloud-free 3D printers for business use

A business that cannot let printers reach the internet can run Bambu Lab, Prusa and Klipper printers on a local network or fully offline, and each has a local way to manage several printers. Plan for offline firmware updates, and check what support each maker gives in its local mode.

• Fully offline. Bambu Lab’s white paper says its printers “can be used entirely offline. Simply disconnect from the network and use an SD card or USB Drive to print your models.” Prusa offers leaving the Wi-Fi module out altogether.
• Bambu Farm Manager. Bambu Lab’s Windows server and client send files and commands to printers “only within your local network through an encrypted channel”, which it says meets “the network supervision requirements of enterprises and universities”. The client still needs internet and a Bambu Lab account for activation, printer verification and firmware downloads, and printers join with LAN mode off.
• Prusa Connect Local. Prusa’s self-hosted version of Prusa Connect is free in early access. It runs the MK4/S, MK3.9/S, MINI, XL, CORE One, CORE One L and iX on firmware 6.4.0 or newer. Prusa says: “Disconnect your network from the internet and everything keeps working.”
• Klipper printers. Each printer serves its own Mainsail or Fluidd page on your network. Obico’s server, open source under the AGPL v3, adds AI failure detection on hardware you run yourself.
• Support. On current Bambu Lab firmware, third-party software needs Developer Mode to control a printer directly, and Bambu Lab “will not be able to provide customer support for this mode”. See Bambu Lab Developer Mode.
• Firmware. Bambu Lab, Creality, Flashforge, Prusa, QIDI and Sovol document updates from a memory card or USB drive. Anycubic documents none, so an Anycubic printer kept off the internet stays on its current firmware.