I kept losing my Vortex Razor HD Gen II scope tool. This is a very useful all in one tool to have at the range. So I dug around and found a 2mm allen wrench that can be embedded in to this print midway through, then sealed by finishing the print.

*** You need to add a pause or filament change right before the print starts closing the hole.

Also, it's a tight fit on purpose. I found the best way is to put a dab of super glue inside to hole the allen wrench and let thr print finish unobstructed.