Minecraft Creeper face inserts. I found a creeper model I liked from Iain Willis' page and made eye and mouth inserts to accentuate the face of the model. I printed mine in Galaxy Black and it came out really well. The print is modeled at 100% of the original Creeper model so when printing the face model scale it down to 99.95% or lower so the pieces will fit in properly. They should fit in snug with no glue required. I did use a hammer to get them in easier. They will sit flush but I left my models with them protruding a little for a more block effect.
Bambu P1S
Galaxy Black PLA
Nozzle: 0.4
Layer: 0.2
Walls: 2
Density: 100%