Upgrade Kit for Prusa Mini+ 3D Printer – Transforms Mini+ to Dual Z-Axis Direct Drive with Input Shaper

Description

A dual Z-axis upgrade solution specifically designed for the Prusa MINI/MINI+, which accurately addresses the core pain points of the single Z-axis structure + remote extrusion design — "Z-axis unevenness" and "XY-axis offset". After the upgrade, it directly transforms into an "MK4S mini version" equipped with dual Z-axis direct drive + Input Shaper technology.

No complex modifications are required—beginners can complete the installation by following the instruction manual. The printing precision (repeat positioning accuracy of ±0.04mm) and material compatibility (full support for PETG/TPU) are significantly improved, while original factory components can still be retained.

Core Features

·         Dual Z-axis Synchronous Drive: Eliminates uneven stress on one side completely, improves repeat positioning accuracy from ±0.12mm to ±0.04mm, and completely resolves the layer line offset issue.

·         Integrated Direct Drive Extrusion: Replaces the bowden extrusion system. It prevents clogging when printing with high-viscosity materials (PETG) and ensures trouble-free retraction when using flexible materials (TPU).

·         Input Shaper Vibration Suppression: The XBuddy mainboard comes with a built-in accelerometer. When printing at a high speed of 200mm/s, the surface roughness (Ra) of the model is reduced from 3.2μm to 1.6μm, and resonance noise is significantly lowered.

·         Beginner-Friendly Design: No soldering or custom programming is required. With the pre-flashed mainboard and step-by-step instruction manual, even users with no experience can get started quickly.

Design concept

With "simplicity, high cost-effectiveness, and strong compatibility" as the core, it minimizes the threshold for upgrading:

Zero-destructive modification: No changes to the original frame, heated bed, or control system; all components fit the original machine dimensions, and installation/removal does not damage the printer.

Compact and space-saving: After the upgrade, the overall footprint remains the same as the original machine. It can be installed even on a small desk, and components can be lifted as a whole during future maintenance without disassembling the units.

Print Instructions

It is recommended to use PETG material to print plastic parts (compatible with higher-temperature printing scenarios).

Assembly instructions and video

For detailed installation instructions, please download the “PRUSA MINI+ Upgrade Installation Manual V1 20250820.pdf” in the "Other files" section at the bottom of the page.

Assembly instructions：https://guides.bear-lab.com/Guide/Upgrade+Prusa+Mini++3D+Printer+to+Dual+Z-Axis+Direct+Drive+with+Input+Shaper+Printer+Guide/109?lang=en

The complete assembly tutorial has been uploaded to YouTube. It covers everything from checking the parts to calibrating the parameters. Beginners can follow along and assemble it step by step:

Upgrade Kit List

YZ frame sheet metal parts 1

Profile (long) 2

Profile (short) 2

Front plate (short) 1

Rear plate (long) 1

Z motor 1Z-axis motor 

1 to 2 wires 1

Mainboard power switch and extension cable 1

USB drive 1

Cable conduit 2, etc.

Get upgrade kit

USA：https://www.amazon.com/dp/B0FM76L72M 

DE：https://www.amazon.de/dp/B0FQB5S8S7

https://www.aliexpress.com/item/1005011773821988.html

Note: The kit does not include 3D printed parts (you need to print them yourself or add them to your order)