Soil Test Sampler Probe Tool

I made this for taking yard or garden soil samples.  It has a half inch diameter cutting edge which expands into a 5/8" collection tube to reduce friction.  I printed in PLA at default settings except for wall loops set at 3 and infill set at 25% and it seemed to be sufficiently strong.  No support.  Not that it matters but I'm using this to get samples for the Yard Mastery soil testing kit.