A pencil extender for a Blackwing pencil. I modelled it as accurately to the real thing as possible. The version you can buy doesn't include a slot to put the eraser into, which I wanted in mine. I reflexively flip the pencil to erase so it was a must have for me. Two versions are included, one with built in brim-ears for better bed adhesion as it has very little to hold it in place. I printed mine in ABS but i'm sure any filament will do. May modify in the future to include a slot to insert a metal rod into it for stiffness/weight