Prusa Mini MGN9H X Axis Upgrade

This mods replaces the original toolhead setup with an MGN9H Linear Rail for increased stiffness and speeds. It also requires a Hotend with Dragon Style mounting (for example Pheatus Dragon Hotend), and a 5020 Fan like on the MK4S. 

Hardware Requirements

• Dragon-style hotend
• 5020 Radial Fan
• ECAS04 Bowden Coupler
• 285mm MGN9H Linear Rail
• 1x DIN912 M3x10
• 2x DIN912 M3x14
• 4x DIN912 M3x8
• 1x DIN912 M3x18
• 3x DIN912 M3x25
• 4x M3 Hex Nut
• 2x M3 Square Nut
• New Longer belt (use the old as a reference and add around 50mm)

Assembly Instructions

1. Dissasembly the existing X Axis until you have reached the Z Axis and can remove the X Axis mount. Also remove rhe 4010 Fan, the probe from the toolhead, as its reused. Also the Idler from the X Idler. 
2. Start the new toolhead assembly. Insert the Nuts into the dragon holder, and add the dragon hotend to. Also insert the square nut and the hex nut into the main body of the toolhead, similiar to the original toolhead. 
3. Insert the Linear Rail into the new XZ Block, and mount it using the M3x10 and M3x14 Screw. This requires also a hex and square m3 nut. 
4. Mount the XZ Block back to the ZAxis, similar to the original assembly, be sure to also already route the belt with the motor. 
5. Slide the main body of the toolhead onto the MGN9H block, and use 2 M3x8 Screws to attach it. 
6. Attach the old Pulley Idler to the new X Idler, using the M3x25 screw and a nylock nut. Next put a M3 Nut into the XIdler block, where the rail slided in. You can already screw an M3x8 Screw into it for tensioning. Then slide the XIdler onto the end of the Linear Rail. Be sure to also route the belt through the idler, though its also possible to do this later. 
7. Attach the belt to the toolhead as in the original assembly. 
8. Mount the Dragon Hotend to the Hotend mount, then attach everything to the main body using the M3x18 Screw. Be sure to have the belts attached in a way where you can tension it properly. 
9. Add back the 4010, Probe Mount with 2 M3x25 Screws to the dragon holder, and with a M3x8 Screw to the main body, similar to the original mount. 
10. Add the 5020 Fan to the Main body, same as the 5015 fan. Be sure to wire it correctly, same as the original fan. You might need to extend the cable. Black → GND, White → Tach, Grey → 5v. 
11. Finished YIPPIEE. Be sure to also readjust your probe z offset.