NOTE: This is still a work in progress. I am new to 3D printing and designing my own stuff so bear with me if you try this and it doesn't work the first time through. 
This is a pen-like tool that is useful for picking up lego via their studs. The single 1x1 studs are tiny and my fingers are too big to easily pick them up and place them. The pen tapers to the actual stud so it's bigger for your hand and gets smaller as you get to the working end. 

I have ran into some issues when it comes to the actual function of the pen so I uploaded two variants of the files. The only difference between them is that the end that attaches to the stud is either 4.95mm or 5mm. 4.95mm will be a more snug fit while 5mm will be looser.

I have uploaded the STL, the STEP file exported from Fusion360 and the PrusaSlicer Project File.

• I printed this on a user-assembled/kit CORE One
  • High-Flow(HF) 0.4 Nozzle
• Sliced on PrusaSlicer v2.9.3 
  • Settings
    • .10mm FAST DETAIL
    • Prusament PLA 
    • No supports
    • 15% Grid Infill
• Prusament PLA Marble Gray