# Longer LK4: specs, SimplyPrint compatibility and setup > **Expected to work** (Most likely). Not confirmed yet, but we expect it to work like the Longer Lk4 Pro. - By Longer, China - Launched 2020 - Canonical page: https://simplyprint.io/compatibility/longer-lk4 ## Longer LK4 at a glance The Longer LK4 is a 3D printer by Longer with a 220 x 220 x 250 mm build volume. - Build volume: 220 x 220 x 250 mm - Enclosure: Open frame - Max print speed: 180 mm/s - Motion system: Bed slinger - Prints well: PLA, PETG, ABS & ASA - Connectivity: USB, SD card ## Connect the Longer LK4 to SimplyPrint | Way of connecting | Status | What you need | Notes | | :--- | :--- | :--- | :--- | | SimplyPrint | Expected to work | | Through OctoPrint | | OctoPrint (Directly, over USB) | Expected to work | A Raspberry Pi running OctoPrint, plugged into the printer with a USB cable | Manual documents 'online printing' over a USB data cable from a computer (serial); like the LK4 Pro. ([Source](https://drive.google.com/file/d/1bGR_w_zgVImEUQdg9F0RrpJWqQP94d84/view)); Expected to work like the Longer Lk4 Pro | | Klipper (Moonraker) | Not compatible | | Ships Marlin 2.0 (LGT board); Klipper only after you install it. ([Source](https://www.longer.net/pages/download-lk4)); Doesn't ship with Klipper: it runs Klipper after you install it in place of its own firmware, a modification | - [How to set up SimplyPrint on Longer LK4](https://simplyprint.io/setup-guide/longer/lk4.md) - [How to set up OctoPrint on Longer LK4](https://simplyprint.io/compatibility/longer-lk4/octoprint-setup) - [Help us confirm](https://simplyprint.io/compatibility/longer-lk4/confirm) ### What works with SimplyPrint Connected through OctoPrint, SimplyPrint is expected to support everything the Longer LK4 lets other software do: the camera and AI failure detection, remote printing, temperature and movement control and AutoPrint. 3 features depend on how it's set up: the table says what each needs. ## What slicer to use for the Longer LK4 None of the slicers in SimplyPrint's cloud has a ready-made profile for the Longer LK4, but it takes standard G-code: start from a similar printer's profile and set the bed size, height and nozzle to match. - [PrusaSlicer](https://simplyprint.io/features/slicer/prusaslicer): No profile for the Longer LK4 · Runs in the SimplyPrint cloud - [OrcaSlicer](https://simplyprint.io/features/slicer/orcaslicer): No profile for the Longer LK4 · Runs in the SimplyPrint cloud - [BambuStudio](https://simplyprint.io/features/slicer/bambustudio): No profile for the Longer LK4 · Runs in the SimplyPrint cloud - [ElegooSlicer](https://simplyprint.io/features/slicer/elegooslicer): No profile for the Longer LK4 · Runs in the SimplyPrint cloud - [CrealityPrint](https://simplyprint.io/features/slicer/crealityprint): No profile for the Longer LK4 · Runs in the SimplyPrint cloud - [Cura](https://simplyprint.io/features/slicer/cura): No profile for the Longer LK4 · Runs in the SimplyPrint cloud - [Kiri:Moto](https://simplyprint.io/features/slicer/kirimoto): No profile for the Longer LK4 · Runs in the SimplyPrint cloud We only list slicers you can use in the SimplyPrint cloud, so there may be others for the Longer LK4. ## The app for the Longer LK4 SimplyPrint works as the Longer LK4's app: on your phone and in any browser, with a slicer in the cloud. - An app for iPhone and Android, the same in any browser, and a slicer in the cloud. - More than monitoring: a print queue, AI failure detection, AutoPrint and accounts for a team. - Printers from many brands in one place, side by side. - Hosted in Frankfurt, Germany, under the GDPR. [Connect the Longer LK4 to SimplyPrint, free](https://simplyprint.io/setup-guide/longer/lk4) · [App Store](https://apps.apple.com/app/simplyprint-3d/id1519749400) · [Google Play](https://play.google.com/store/apps/details?id=com.simplyprint.appdev) ## Automate the Longer LK4 **Bed slingers are the easiest to automate.** The Longer LK4 moves its bed back and forth, so its plate comes out to the front of the printer. That's what plate swappers like these use: they take the finished plate off and slide a fresh one on. Without a kit, a G-code routine can push cooled prints off with the toolhead. For example: [JobOx](https://simplyprint.io/features/autoprint/jobox), [swapmod](https://simplyprint.io/features/autoprint/swapmod). ### Ways to automate it - [Push prints off with the toolhead](https://simplyprint.io/features/autoprint/push-off): On a bed slinger, a G-code routine can sweep the cooled print off the bed before the next job starts. - [Your own ejection G-code](https://simplyprint.io/features/autoprint/custom): Write the routine that clears your plate, and AutoPrint runs it after every print. - [A robot arm, or anything with an API](https://simplyprint.io/features/autoprint/api): Tell SimplyPrint the plate is clear through the API or a webhook, from a robot arm or your own system. - [Clear it by hand, keep the queue](https://simplyprint.io/features/autoprint/manual-mode): AutoPrint waits for you to mark the plate clear, then starts the next job. [How AutoPrint works](https://simplyprint.io/features/autoprint). AutoPrint comes with the Pro plan and up. ## Longer LK4 specifications: bed size, print height and more ### Size - Build volume: 220 x 220 x 250 mm - Bed type: Square - Bed size: 220 x 220 mm - Max print height: 250 mm ### Printing - Enclosure: Open frame - Motion system: Bed slinger - Max print speed: 180 mm/s - Max extruder temperature: 250 °C - Has heated bed: Yes - Max bed temperature: 100 °C - Number of nozzles: 1 - Toolheads: 1 - Direct drive: No - Probing tool / Auto Bed Leveling: No - Filament width: 1.75 mm ### Multi-material - Toolchanger or hotend changer: No - IDEX (independent dual extruders): No ### Connecting - Connectivity: USB, SD card - Prints from: microSD card - Supports serial printing: Yes - Shipped firmware: Marlin ### Files and slicing - Supported file formats: G-code (.gcode, .gco, .g) ### The printer - Printer manufacturer / brand: Longer - Printer model name: LK4 - Made by a company from: China - Launched: 2020 [Read more by the manufacturer](https://www.longer3d.com/products/longer-lk4-3d-printer) ## What filament can the Longer LK4 print? Filament compatibility for the Longer LK4: the materials Longer lists for it. | Filament | Suitability | Notes | | :--- | :--- | :--- | | PLA | Great | On the maker's list of materials for this printer. | | PETG | Great | Comfortably in range (PETG likes a ~230-250C hotend and a ~70-85C bed). | | TPU & flexibles | With care | Possible, but a Bowden extruder makes flexibles harder - print slowly and prefer firmer (higher-shore) TPU. | | ABS & ASA | Great | On the maker's list of materials for this printer. | | Nylon (PA) | With care | Possible with care - an enclosure and very dry filament are essential. | | Polycarbonate (PC) | Not ideal | Not recommended - PC needs very high hotend temps and an enclosed chamber. | | Carbon-fiber & glass-filled | With care | Possible if you fit a hardened or wear-resistant nozzle - the abrasive fibers quickly wear a stock brass nozzle. | ### Best filament for the Longer LK4 Filaments the Longer LK4 prints well, Longer's own first, then the best known. - [Bambu Lab PLA Basic](https://simplyprint.io/filaments/bambu-lab/pla-basic): PLA, 190-230 °C - [Bambu Lab PLA Matte](https://simplyprint.io/filaments/bambu-lab/pla-matte): PLA, 190-230 °C - [SUNLU PLA](https://simplyprint.io/filaments/sunlu/pla): PLA, 200-240 °C - [Anycubic PETG](https://simplyprint.io/filaments/anycubic/petg): PETG, 230-250 °C - [Anycubic PLA Basic](https://simplyprint.io/filaments/anycubic/pla-basic): PLA, 190-230 °C - [Anycubic PLA Plus](https://simplyprint.io/filaments/anycubic/pla-plus): PLA, 190-230 °C - [Bambu Lab ABS](https://simplyprint.io/filaments/bambu-lab/abs): ABS, 240-270 °C - [Bambu Lab ASA](https://simplyprint.io/filaments/bambu-lab/asa): ASA, 240-270 °C ## Compare the Longer LK4 with similar printers - [Longer LK4 X](https://simplyprint.io/compatibility/longer-lk4-x): Expected to work, 220 x 220 x 250 mm, Also by Longer · Similar build volume · Also prints ABS & ASA - [Creality Ender-3 S1 Pro](https://simplyprint.io/compatibility/creality-ender-3-s1-pro): Compatible, 220 x 220 x 270 mm, Similar build volume · Also prints ABS & ASA - [Anycubic Mega SE](https://simplyprint.io/compatibility/anycubic-mega-se): Expected to work, 220 x 220 x 250 mm, Similar build volume · Also prints ABS & ASA - [ELEGOO Neptune 2S](https://simplyprint.io/compatibility/elegoo-neptune-2s): Expected to work, 220 x 220 x 250 mm, Similar build volume · Also prints ABS & ASA - [Compare the Longer LK4 with other printers](https://simplyprint.io/compatibility/compare?compare=longer-lk4#choose) ## Where to buy the Longer LK4 - [Longer's global store](https://simplyprint.io/buy/8324) (Official store) ## About Longer Longer (Shenzhen Longer 3D Technology Co., Ltd.) is a Chinese maker of budget FDM and resin 3D printers, laser engravers and UV printers. Its LK series of open-frame bed slingers, up to the LK5 Pro it still sells, is aimed at beginners, and it also built the Alfawise U20 and U30 sold under another name. In 2026 it added the LK10 and LK10 Plus, which run on a Klipper board. - Headquarters: Shenzhen, China - Ownership: Shenzhen Longer 3D Technology Co., Ltd., privately held - Website: https://www.longer.net Openness: Mixed (3.4 of 5) Published Marlin source, spare parts and slicer support for the older LK line; we found no published source for the new Klipper-based LK10. - Firmware and custom firmware (3 of 5): Longer published Marlin source for the LK1, LK4 Pro and LK5 Pro on GitHub (GPL-3.0, last updated 2022) and Klipper configs for older models (updated 2024). We found no source for the LK10's Klipper firmware. - Third-party filament, slicers and parts (4 of 5): Any filament, and no Longer slicer is required: Cura ships profiles for the LK1 to LK5 Pro and OrcaSlicer for the LK10 and LK10 Plus. Longer sells nozzle kits and hotend parts; we did not confirm which third-party nozzles fit. - Repairs and spare parts (4 of 5): Longer's shop sells LK-series mainboards, touch screens, heated beds, stepper motors, extruders, fans and nozzle kits; it publishes no CAD files. - Community and documentation (3 of 5): Longer runs a download centre with firmware, slicer builds and manuals, and a GitHub account with firmware source and Klipper configs; we found no official forum. ### Pros - Low prices for simple, beginner-oriented printers. - Marlin source published for the LK5 Pro and older models. - Spare parts sold, from mainboards to nozzles. - Profiles in both Cura and OrcaSlicer. ### Cons - No published source for the new LK10's Klipper firmware. - The LK5 Pro's firmware has not been updated since February 2022. - No official forum or community documentation hub found. ### Track record - 2026: Longer launched the LK10 and LK10 Plus, bed slingers on a Klipper board rated up to 500 mm/s. - February 2022: Longer released LK5 Pro firmware V0.4.0, based on Marlin 2; in October 2026 it was still the newest LK5 Pro firmware in Longer's download centre. - November 2020: Longer published the Marlin source for the LK1, LK4 Pro and LK5 Pro on GitHub under the GPL-3.0. How Longer compares with every other brand: https://simplyprint.io/articles/best-3d-printer Affiliate disclosure: Some links on this page are affiliate links. We may earn a commission if you make a purchase, at no extra cost to you. As an Amazon Associate, we earn from qualifying purchases. ## Frequently asked questions ### Is the Longer LK4 compatible with SimplyPrint? Most likely. We expect the Longer LK4 to connect to SimplyPrint via OctoPrint, but nobody has confirmed it yet. If you have one, the setup guide shows within minutes whether it works, and your answer confirms it for everyone. ### How do I connect the Longer LK4 to SimplyPrint? Follow our step-by-step setup guide for the Longer LK4. It shows how to connect it via OctoPrint, what you need for each, and which to pick. ### What slicer should I use for the Longer LK4? Cura, PrusaSlicer and OrcaSlicer all work with the Longer LK4, and you can run any of them in SimplyPrint's online browser slicer - no install needed, on any device. ### Can I use OrcaSlicer with the Longer LK4? Yes, but OrcaSlicer has no built-in profile for the Longer LK4 that we know of: start from a similar printer's profile and set the bed size, height and nozzle to match. ### What filament can the Longer LK4 print? Longer lists PLA and ABS & ASA for the LK4. ### Does the Longer LK4 work with OctoPrint or Klipper? The Longer LK4 works with OctoPrint, and SimplyPrint connects to it through them - so you get cloud access, a queue and camera monitoring on top. ### What is the Longer LK4's bed size and build volume? The Longer LK4 has a 220 x 220 mm print bed and prints up to 250 mm tall, a build volume of about 220 x 220 x 250 mm. See the full specifications table above for bed type, temperatures and more. ### When did the Longer LK4 come out? Longer launched the LK4 in 2020. ### Can the Longer LK4 eject prints automatically? There's no kit for it that we support yet, but SimplyPrint's AutoPrint can push prints off with the toolhead, or run your own ejection G-code, and then start the next job from your queue. ### Where can I buy the Longer LK4? From Longer's own store, which has shops for everywhere else. The links on this page go to those stores; some are affiliate links, so we may earn a commission at no extra cost to you. --- © 2026 SimplyPrint. All rights reserved. This page and the compatibility, specification and review data on it are compiled by SimplyPrint and may not be copied, scraped, reproduced or republished, in whole or in part, without prior written permission. Printer images are the property of their respective manufacturers and are shown for identification purposes only; SimplyPrint claims no ownership of them. Quoted reviews belong to their authors.