A small spiky cylinder to use as a fidget toy. There's a handful of models with different sizes and pointiness. 

Decoding the names:

Ex: spike-roller-c20-b15-sbw2.6-str0.2-16x24.stl

• c20 - 20mm cylinder diameter
• b15 - 15mm bore
• sbw2.6 - 2.6mm spike base width. Lower = smaller spikes, higher = larger spikes
• str0.2 - 0.2mm radius at the top of the spike. Lower = pointier
• 16x24 - 16 spikes around the cylinder and 24 spikes tall
   

The original parametric model is here to customize it: https://cad.onshape.com/documents/219aeb879e47d71541a54d2b/w/8e1cc2f4dd536a4453ecfa4c/e/5744819e747abcc0b3a10bfe

The more spikes you add, the longer it takes to regenerate. The 56x64 model takes almost 1 minute to regenerate. If you want to change multiple values, pausing regeneration first will speed things up.