Solar Yard Lamp Stake

I have a pair of cheap solar lights from Lowe's that provide a few hours of illumination around my front steps in the evening. Over the course of the winter one of them became uprooted and I misplaced the spike the holds it in the ground. So, I designed and printed a new one!

The original was completely cylindrical, but this one has flattened sites to print easily without supports. Still fits perfectly snug.

I understand PLA is a bio-based plastic but I'm not clear on exactly how quickly i