Ender 3 / 3 Pro - useful scripts

Further to this I’ve posted an update to bed leveling on this thingy https://www.thingiverse.com/thing:4904173

I've been finding some of the options and processes on the Ender 3 a tad painful.

I decided that a gcode routine was a simple approach for me.

The first one included here is bed levelling
Added 20/2/2020 filament change routines.

These are based on simple gcode commands, and I'm sure there are other ways to achieve this, so comment away and I'll add/include as appropriate.