Insert for Robox smart reel

An insert for Robox smart reels to facilitate using them on other printers.
Made in PLA on a Prusa Original i3 Mk2.
I was torn between making the insert on the Robox as it's an insert for Robox reels, or on the Prusa - the machine on which I wanted to use the Robox reel.
I plumped for the Prusa.