Prusa i3 Steel direct extruder mount with fan and proximity sensor

Direct extruder parts for Prusa i3 Steel AKA Leonardo. Turbine fan and proximity sensor are optional.

Based on MakerBot aluminium extruder, like this one:

https://www.aliexpress.com/item/Stainless-Steel-Makerbot-Replicator-2X-Extruder-Upgrade-Edition-Full-Metal-Extruder-for-1-75mm-right-1/32776387597.html

And this hotend:
https://www.aliexpress.com/item/3D-Printer-Parts-Integrated-Heatbreak-V6-hotend-Wade-Extruder-Direct-drive-Hotend-Kit-1-75mm-Short/32763540784.html

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