S1 Plus - Automatic Filament Loader

While many of the S1 Plus components have been upgraded to ASA for better resistance to heat and warping, placing the entire unit inside a heated drybox is not recommended. Excessive heat can still damage the electronics inside the S1 Plus, which could lead to failures over time.

A much more reliable setup is to keep the S1 Plus outside the drybox and simply route a filament tube from the drybox outlet to the S1 Plus inlet. This provides the same benefit of keeping filament dry and conditioned while protecting the S1 Plus from unnecessary heat exposure.

In short: the S1 Plus should not be placed directly in a heated drybox. Instead, connect it externally with a tube for a safer, long-term solution.

The S1 Plus integrates with the S1 Plus web app to give you full visibility into your filament usage and inventory. Once connected to Wi-Fi, the S1 communicates with the cloud so you can monitor your setup from anywhere in the world, not just your local network.

Key Features:

• Usage Tracking – The S1 measures exactly how much filament has run through it and reports this to the cloud, giving you precise usage history over time.
  
  
• Inventory Management – The app supports FIFO (First-In, First-Out) inventory tracking, so your filament stock stays organized. You can log new spools, enter orders, and adjust inventory records to keep data accurate.
  
  
• Profiles & Grouping – Create filament profiles for different materials and group multiple S1 units together. This gives you segmented tracking by material type or by groups of printers—helping you better understand how different parts of your farm are performing.
  
  
• Low Filament Alerts – Receive notifications when filament is running low so you can swap spools before a job fails.
  
  

By combining precise usage data, flexible grouping, and cloud-based inventory tools, the S1 Plus makes it easy to manage everything from single-spool tracking to farm-wide material analytics.

The S1 Plus builds on the original S1 with several upgrades designed for improved reliability, durability, and ease of use.

• Reliability Upgrades – The S1 Plus incorporates a variety of hardware improvements that make it more consistent in demanding print farm environments.
  
  
• Stronger Materials – Its housing is printed from durable ASA plastic, offering better heat and impact resistance than the standard S1.
  
  
• Wi-Fi Connectivity – The S1 Plus connects to the S1 Plus app, allowing you to track filament levels, monitor usage, and receive alerts when filament is running low.
  
  
• Adjustable Preload Force – Through the app, you can fine-tune the filament preload force. This makes the S1 Plus easier to set up across a wider range of printers and filament types.
  
  

In short, the S1 Plus offers added durability, smarter connectivity, and greater flexibility—making it the preferred choice for users who want the most reliable, adaptable version of the Infinity Flow S1 system.

While the S1 and S1 Plus may look similar, they are almost completely different internally. The S1 Plus was redesigned from the ground up with upgraded components, stronger materials, and improved electronics for better long-term reliability. Because of this, it does not make sense to replace every part of the S1 in a conversion kit.

Instead, early adopters have two upgrade options:

1. S1 Upgrade Kit – Improves reliability on the original S1 by replacing the gearboxes and filament junction with the upgraded ASA versions used in the S1 Plus. This increases durability and wear resistance but does not add Wi-Fi, app connectivity, or adjustable preload force.
2. Early Adopter Discount – As a thank-you, original S1 customers can upgrade to the S1 Plus with an extra 10% off using the code PLUS-UPGRADE. This stacks with launch day discounts, is valid for one order (with as many S1 Pluses as you want), and must be placed using the same email tied to your original S1 purchase. The discount is valid through August 31, 2025.

Yes! As a thank-you to our early adopters, anyone who previously purchased an S1 (through Kickstarter or our website) can claim an exclusive discount when upgrading to the S1 Plus.

• Use the code PLUS-UPGRADE at checkout to get an extra 10% off.
• This discount stacks with launch day pricing, giving you even more savings.
• The code is valid for one order, but you can include as many S1 Pluses as you’d like in that order.
• Orders must be placed using the same email address you used for your original S1 purchase.
• The discount expires on August 31, 2025.

The original S1 was produced entirely from high-performance PLA, chosen for its strength and dimensional stability.

The S1 Plus improves on this by printing all of its critical components (gearboxes, filament junction, etc.) out of ASA, a material known for its higher durability, heat resistance, and long-term reliability compared to PLA. This upgrade makes the S1 Plus more robust in demanding environments such as print farms.

The roller sides of the S1 Plus are still made from high-performance PLA, balancing strength with reduced weight and easier replacement when needed.

The S1 Plus is designed to make filament transitions seamless, minimizing any potential defects. The filament is fed smoothly to ensure the quality of your print is maintained.

No, the S1 Plus automatically switches filaments without requiring the printer to pause. It ensures a smooth transition between spools to keep your prints going.

Yes — the S1 Plus is compatible with the vast majority of FDM 3D printers that use 1.75 mm filament.

• Broad Compatibility – Since the S1 Plus relies on filament tension and preload rather than direct firmware integration, it works with most printers out-of-the-box.
• Adapter Support – Many popular printers already have community-designed mounting adapters available online, which you can download and 3D print to attach the S1 Plus securely to your setup.
• Flexible Setup – Even if a specific adapter doesn’t exist for your printer, the modular design of the S1 Plus makes it easy to create or customize a simple adapter to fit your machine.
  
  

In short, if your printer runs on 1.75 mm filament, there’s a very high chance the S1 Plus will integrate smoothly with your setup.

Yes, the S1 Plus supports standard FDM filament types such as PLA, ABS, PETG, and others. Flexible filaments like TPU are not guaranteed to work with the S1.

The S1 Plus is not designed for color-changing or multi-material setups but focuses on automatic filament switching, ideal for extended prints with single filament types.

Absolutely! You can download and print adapters from various online sources to fit your specific printer. 3D printed adapters work well with the S1 Plus.

The S1 Plus prevents print fails by automatically switching to a new spool when the current one runs out, so there’s no need to pause the print or intervene manually.

The S1 Plus allows you to use every last bit of filament on your spools when automatically switching to the next spool, eliminating waste.

Yes, the S1 is compatible with both Bowden and Direct Drive extruders. Adapters may be required for different setups, and we provide guidelines on how to connect the S1 to your printer.

The S1 Plus manages retractions by applying a constant forward preload force on the filament during printing.

• When the preload force decreases, the S1 Plus recognizes that the printer is extruding filament and pushes it forward smoothly.
  
• When the preload force increases, the S1 Plus interprets this as a retraction command and automatically backs the filament up.
  

Unlike the original S1, which only had a fixed preload force, the S1 Plus allows users to adjust the preload level through the app. This makes it easy to fine-tune performance for different printers, materials, and retraction settings.

If you previously experienced retraction issues with the original S1, you can now simply reduce the preload level in the app to improve compatibility and reliability with your setup.

The S1 Plus acts as a filament buffer by applying a constant forward preload force on the filament and continuously tracking the 3D printer’s extruder.

• When the printer pulls filament, the S1 Plus automatically adjusts, keeping the filament under light, steady tension.
  
• This buffering effect smooths out fluctuations in filament feeding, reducing the sudden load changes that normally happen when a printer pulls directly from a heavy spool.
  
• Because of this preload system, the printer requires less effort to pull filament, which can help prevent under-extrusion issues—especially on setups with long filament paths, Bowden tubes, or heavy spools.
  
  

In essence, the S1 Plus works as a smart filament buffer, delivering consistent forward force so your printer extruder can focus on precise extrusion rather than fighting against spool drag or uneven feeding.