Skull Ring

-inside diameter around 18mm
- scale it to your size using Tinkercad or directly in makerware
- Wearing the abs version permanently for months; noticed somes deflexions and failures after hard hands work and had to plastic-solder it once.
- I noticed that wearing the abs version of my skull ring could cause dry skin so I post a pla version of that thing. Look forward to see if it cause the same problem...