This is an adapter for use with the Cricut Explore Air that allows you to use two tools. I made this to use with the Circuit Scribe Gel Pen to be able to draw custom circuit designs using the their silver conductive ink. The housing is similar to many other gel pens on the market as well as many other Sakura branded/styled pens. It should work without needing the popsicle stick spacer or any of the other weird workarounds. I printed mine in solid infill in PLA. Will upload updates as it evolves.