S1 Upgrade Kit

Name: S1 Upgrade Kit
Brand: Infinity Flow 3D
SKU: UPGRD-S1
Price: 44.99 USD
Availability: InStock

$44.99

The S1 Upgrade Kit refreshes your original S1 with new gearboxes and filament junction for improved reliability. This kit does not add Wi-Fi or app connectivity of the S1 Plus.

Improved Reliability

Improved Wear Resistance

3 Preload Force Firmware Options

No Wi-Fi connectivity

No filament level tracking

Manual firmware uploads for preload force level changes

Product variants

Quantity

Product information

What is a Lead Time?

A lead time is the period between when you place your order and when your order is shipped. Lead times can vary depending on product availability, production schedules, and order volume.

Our Standard Lead Times

In-stock items: Usually ship within 2–3 business days.
Pre-order or backordered items: Lead times will be shown on the product page. You’ll see the expected shipping timeframe before placing your order.
Custom or special orders: May require additional handling time, which will be clearly communicated during checkout.

When to Expect Your Shipment

Once your order ships, you’ll receive a tracking number by email. Delivery times will then depend on the shipping carrier and the option you selected at checkout.

Need an Update on Your Order?

If you’d like an update on your order status, please reach out through our Contact Page. Our team will be happy to help.

We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.

To be eligible for a return, your item must be in the same condition that you received it, undamaged, including all parts and accessories. You’ll also need the receipt or proof of purchase such as an order number.

To start a return, you can contact us at contact@infinityflow3d.com.

If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

You can always contact us for any return question at contact@infinityflow3d.com.

3D Printer Incompatibility

If the Infinity Flow S1 is not compatible with your printer, please contact us at contact@infinityflow3d.com within 30 days of delivery. Our team will work with you to determine if the issue can be resolved through adjustments or support. If we’re unable to provide a solution, you may return the item for a full refund. The return shipping label will be prepaid.

Damages and issues

Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right. In most cases, we’ll arrange a replacement or exchange rather than a full return for damaged products.

Non-Returnable Items

We do not accept returns on:

Opened or used items that are not defective or incompatible
Gift cards
Items marked as final sale
Items damaged due to improper use, modification, or incorrect installation

Refunds

We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at contact@infinityflow3d.com.

Requires S1 Firmware Change (see installation guide)

What it does:

Replaces the gearboxes with the newest design (printed out of ASA for better durability)
Replaces the filament junction with the newest design (Printed out of ASA for better durability)
Extends the lifespan and consistency of your S1

What is does not do:

Add Wi-Fi connectivity
Enable S1 Plus App connection
Change your S1 into an S1 Plus
Add motor back-drive protection

Shipping is currently limited to the US and Canada.
FREE SHIPPING to lower 48 States for orders over $100.
Track your order status anytime through your account.

Package Dimensions: 10 x 6 x 3 in

Package Weight: 2 lbs

S1 Plus gearboxes (both sides)
S1 Plus Filament Junction
S1 Plus Filament Junction Cover
Nylon Lower Tubes (x2)

S1 Upgrade Kit Install Guide

Overview The S1 Upgrade Kit is designed to improve the reliability of the original S1 by replacing the gearboxes and the filament junction with the newest versions, now printed in...

Learn more

Firmware Options

Changes require manual upload to S1

Only For S1's with Upgrade Kit Installed

Low Force

(~20% lower than a standard S1)

Medium Force

(similar to a standard S1)

High Force

(~30% higher than a standard S1)

See Uploading Instructions

Frequently Asked Questions

Answers to some of the most common questions we get:

How do the three preload options for the S1 Upgrade Kit work?

The S1 Upgrade Kit includes three firmware options that change the preload force of your Infinity Flow S1. These firmware versions are designed only for upgraded S1 units and must be uploaded manually (they are not accessible through the app).

Low Preload Force – About 20% lower than stock. Best for lighter setups where less pressure is needed.
Medium Preload Force – Matches the original stock S1 preload.
High Preload Force – About 30% higher than stock. Provides added preload for challenging filament paths or long Bowden tube runs.

Since wear over time can reduce the force of a standard S1, the medium setting on an upgraded unit may actually feel stronger than a well-used S1.

This reduction in preload force over time has been solved in the S1+ (and S1 upgrade kit).

To switch between these levels, simply upload the corresponding firmware file to your upgraded S1.

Does the Upgrade Kit turn my S1 into an S1 Plus?

No—the Upgrade Kit does not convert an S1 into an S1 Plus. While it uses the same gearboxes, motors, and filament junction as the S1 Plus, it does not replace the main PCB.

Because of this, several S1 Plus features remain exclusive to that model:

Wi-Fi connectivity
S1 Plus App integration
Adjustable preload force via the app
Built-in electrical safety protections (motor backdrive protection, variable motor current for cooler operation, overvoltage protection)

The Upgrade Kit focuses solely on mechanical reliability—with ASA-printed components that resist creep, stronger gearboxes, and an updated filament junction to reduce wear and filament grinding. These upgrades extend the life of your S1, but they do not add the full feature set of the S1 Plus.

If you want improved reliability while keeping your current setup, the Upgrade Kit is a great choice. If you want all the advanced features, upgrading to the full S1 Plus is the way to go.

Why is the S1 Plus Main PCB not included in the kit?

The S1 Upgrade Kit is focused on mechanical reliability, not electronics. The S1 Plus main PCB is not included for several important reasons:

Individual Calibration – Every S1 Plus is individually calibrated and tested in-house before it ships. This ensures that preload settings, safety features, and firmware are all tuned correctly for each unit. That level of calibration cannot be replicated with a user-installed upgrade kit.
Firmware Security – The S1 Plus boards are connected to our cloud servers and cannot be directly reflashed by users. This is for security reasons, so that only verified firmware updates can be pushed to connected devices. A “default” calibration cannot be used, because we need the ability to send custom firmware adjustments when necessary for upgraded S1's thave have not been pre-calibrated.
Flexibility of the Original S1 Boards – By keeping the original S1 electronics, users can still take advantage of firmware updates we release for different preload settings. These can be flashed directly by the user, giving more flexibility in setups that may require lighter or heavier preload force.

Because of these reasons, the Upgrade Kit does not include the S1 Plus main PCB. Instead, it focuses on improving the mechanical components of the original S1—gearboxes, motors, and the filament junction—for a significant reliability boost without changing the device’s electronics.

Can the upgraded S1 be used in a heated filament dryer?

No. While the Upgrade Kit replaces the gearboxes and filament junction with parts printed in ASA for greater heat resistance and long-term durability, the electronics inside the S1 are still vulnerable to heat. Prolonged exposure inside a heated filament dryer can damage the PCB and other electronic components.

For the best results, we recommend keeping the S1 outside of heated environments. If you need to use a dryer, route a filament tube from the dryer’s outlet to the S1’s inlet. This setup keeps your filament dry while protecting your S1 from heat damage.

What improvements does the Upgrade Kit provide?

The S1 Upgrade Kit brings significant reliability upgrades to the original S1 by replacing its most critical moving parts—the gearboxes and the filament junction.

Gearboxes – The new design offers improved wear resistance, reducing the chance of filament grinding during reloads.
Filament Junction – Redesigned to be stronger and more consistent. This reduces misfeeds and improves reliability during automatic reloads.
ASA Printed Components – Both the gearboxes and filament junction are now printed in ASA, rather than PLA+. ASA resists heat better and is far less prone to plastic creep over time, which means critical parts maintain their shape and performance better over time in harsher environments.

Together, these upgrades make the S1 less likely to grind filament, jam, or wear down under the constant preload force. The result is smoother operation, fewer reload issues, and a much longer service life for your S1.