Prusa Research Original Prusa XL Manual Del Usuario página 36

PASO 12 CoreXY assembly: parts preparation
For the following steps, please prepare:
CoreXY assembly (1x)
M3nEs nut (6x)
PASO 13 CoreXY assembly
Measure approximately 23 cm (9") from the right extrusion.
Insert three M3nEs nuts into the left extrusion.
Insert three M3nEs nuts into the right extrusion.
36 Original Prusa XL Cinco Cabezales (Semi-Ensamblada)
3. Montaje CoreXY y parte trasera