ReMIX35 is an open-source electronics upgrade kit that brings modern MK3.5 capabilities to the trusted Prusa MK3S and MK3S+, printers that have set a standard in the 3D printing world. Fully compatible with the official MK3.5 firmware and Prusa’s software tools, ReMIX35 works with both original machines and high-quality clones.

The upgrade is fast, non-invasive, and easy to install—no rewiring and no complex teardown required. Built around the original Einsy RAMBo form factor, ReMIX35 offers a drop-in solution that extends the life and performance of these beloved machines.

Overhaul Your 3D Printer

Instead of buying a whole new printer, ReMIX35 builds on the proven Prusa MK3 platform to extend your printer’s usefulness, bringing it closer to today’s standards.

The difference is striking—prints that once took ten hours now finish in less than six, thanks to higher speeds and four times the acceleration. You’ll notice the difference from the very first layer: ReMIX35 maintains a more uniform surface across the entire bed, making it possible to print large or edge-positioned parts with confidence.

Thanks to ReMIX35’s higher reliability, failed prints are rare, about one in every 6–8 kg of filament, usually due to external factors. Maintenance becomes a less frequent hassle, with the time between nozzle clogs going from every six months on the MK3S+ to over a year with the ReMIX35. Add in superior print quality, fewer artifacts, and the convenience of USB file loading, and the result is clear: ReMIX35 is an upgrade that delivers up to 50% improvement in real-world printing, letting you focus more on creating and less on troubleshooting.

Features & Specifications

• Processor: Custom 32-bit Einsy electronics powered by STM32
• Motor Drivers: Trinamic TMC2130
• Power Supply: 24 VDC
• Connectivity:
  • USB for firmware updates and loading G-code files
  • PrusaLink via Ethernet or ESP-01S Wi-Fi module
• Display: 3.5" full-color touchscreen
• Compatibility: Works with Original Prusa MK3S/+ (not MMU3 compatible)
• Installation: Simplified setup using only basic tools (Allen keys and Phillips screwdriver)
• Dimensions:
  • Einsy board: 105 × 71 × 21 mm (4.13 × 2.80 × 0.83 in)
  • Display board: 125 × 61 × 40 mm (4.92 × 2.40 × 1.57 in)
  • LCM panel: 85 × 55 × 4 mm (3.35 × 2.17 × 0.16 in)
• Weight: 300 g (10.5 oz)
• Firmware: Compatible with the official Prusa MK3.5 firmware

Open Source

ReMIX35 is designed to be open hardware. Right now you can already find many of our project files, board schematics, and bill of materials for your perusal. The BoM includes the Einsy-compatible motherboard, display module, and LCM panel but be aware that some changes may occur between now and when we ship our project. Our board is compatible with Prusa’s first-party software and firmware.

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