Sapphire Dragon Orbiter

This is now in open beta! DO NOT PRINT THE COOLER IN PLA.

Goals:
--Try to balance weight above and below the movement plane
--Avoid a printed carriage
--Keep it light-ish
--Provide a direct filament feedpath that is almost fully constrained
--Kill some time in CAD
--Reuse the stock metal carriage
--I will never make this for the e3d hotend. Groovemount needs to die.

Extruder parts:
---Follow the guide for assembly of "The Orbiter" https://www.thingiverse.com/thing:4223085
---I used the 7.2:1 ratio extruder. The aluminum spider available via aliexpress will not work out of the box for the 7.2 version, only the 7.5:1. If you are willing to sit there with sandpaper on glass and a drill for about three hours, it will work. The 7.5:1 is easier to make work, but the 7.2:1 is completely silent in operation.

Printed parts:
2x of tensioner_slider
2x Stepper spacer. Minimum 100% scale (12mm) for 15mm screws. I use 15mm (125% Z scale with 20mm M3 screws to space the steppers