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Prusa MINI coreXY

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Model information

Source
Printables
Category
Prusa Parts & Upgrades
License
Creative Commons — Attribution — Share Alike
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Simple and low cost upgrade of Prusa MINI to coreXY motion system. It uses much more of the original MINI than other “upgrades”. It keeps the original extruder, hotend, board, display, steel rods, bearings, bolts, and ALU extrusions.

First print:

Advantages

  • More stable frame

  • Enclosure panels mountable on the frame directly (improves rigidity)

  • Lightweight

  • Higher air temperature (printing at the top)

  • Higher bed temperature (110 °C)

  • Higher chamber temperature if enclosed (smaller chamber)

  • Smaller footprint

  • Bigger printing size (Z)

  • Optional direct drive upgrade to Sherpa/TBGS/HGX extruder mount (43.5 mm bolt span) - requires different cable connector

  • Steel rods or linear rails on Y axis
     

Disadvantages

  • Slower speed (300 mm/s) due to chip speed limitation

  • Higher current (450 mA) to keep original acceleration (4000 mm/s²)

  • Requires non-original MINI mainboard or breaking of the appendix (original mainboard) to load alternative FW (https://github.com/Snake-Edition/P32-FW/releases)

  • Some mechanical work to do (no re-wiring or soldering)

  • Original input shaper parameters won't work as good

  • More noise (amplified by the frame and panels)
     

Size comparison

 

Prusa MINI

MINI coreXY

Transport X

330

300

Transport Y

320

300

Transport Z

380

520

Case X

430

310

Case Y

500

310

Case Z

470

570

Print X

180

180

Print Y

180

180

Print Z

180

255

Print space

5.8 l

8.2 l

Enclosed space

101 l

54 l

Weight

4.5 kg

5.3 kg

Weight enclosed

14 kg

~ 9.5 kg

Parts to buy (minimal)

  1. 1x 3030 extrusion 240 mm

  2. 2x 3030 extrusion 320 mm

  3. 8x idler

  4. 2x 1100 mm 2GT-6 belt

  5. bolts TBD

Parts to buy (optimal)

  1. parts for minimal mod

  2. 1x 3030 extrusion 300 mm (bottom)

  3. 2x 3030 extrusion 240 mm (bottom)

  4. 2x 3030 extrusion 285 mm (bottom)

  5. 1x 3030 extrusion 300 mm (top)

  6. 1x 3030 extrusion 240 mm (top)

  7. 2x 3030 extrusion 270 mm (top)

  8. 5x enclosure panel

  9. door

  10. bolts and nuts TBD

If you have another MINI frame, you can use all three extrusions.

Frame Variants

  1. L frame (cheap)

  2. complete bottom frame

  3. complete frame (top and bottom)

Direct drive extruder (HGX)

  • Fix the cable connector

  • Insert nuts into the top mount

  • Insert ~65 mm PTFE tube into hotend heatsink. The correct length depends if you have original or non-original hotend. The correct length is if the extruder is “levitating” ~0.5 mm above the frame.

  • Use M3x12 and M3x16 (or 20) for extruder mounting

  • Adjust current and gear ratio in slicer profile:

    • M906 E500 ; HGX higher current (500 mA)

    • M92 E570 ; HGX steps per mm

Comments

Use provided .ini file for PrusaSlicer. One for original extruder, one for HGX.

No manual available (yet).

Tags

upgradeoriginalcore