Knafs Lander 2 - Backspacer

This adds a backspacer to the Knafs Lander 2.

The alternate backspacers have storage space for a Combat Trodden sized glass breaker or an E3D printer nozzle. I have no idea if a tungsten carbide printer nozzle will break glass, but please don't try, glass breakers on knives are dumb. Just use this to store and transport your spare nozzles as it was intended to.

Lander 3 version here: https://www.thingiverse.com/thing:6557709