Z-Offset-flow-z-seam Calibration Cone

This is an accidental discovery (developed using Klipper, but it should work with Marlin as well). I built this model to do fast Z-seam tests and discovered it does more than what it intended.

This little cone has a small void at the bottom, so print it with supports. It's a good way to test if your support system is set up right based on how well-tuned your Z-offset is. If you print it right, the support will pop off on the bed or easily come out with tweezers. If not, then your offset is incorrect, or your flow is incorrect. (for flow adjustments, I recommend doing a hollow cube first, then do this one and adjust by 1% to fine-tune your flow).

How this works, if you print the cone with your current settings, you'll either see an elephant's foot on the bottom (the cone has a cylinder base on it) or also, depending on the material you print with, it will either look warped or lifted if the offset is not correct. Adjust your offset until it prints perfectly. This model will help fine-tune your Z-offset, not initially calibrate it where you normally should use paper or a feeler gauge to get a good start. 

This print uses only 1g of material and should take anywhere from 4-16 minutes (depending on your speed settings - I'm printing mine at 160mm/s)

Print Settings are based on what layer height you want. Adjust your offset based on the layer height you are printing with. Print with supports on. 

In terms of Z-seam testing/tuning, I would play with the following settings in your slicer to get the best results (my settings for PETG in brackets):
Retraction Distance (.1)
Retraction Speed (70mm/s)
Retraction Prime (0)
Outer Wall Wipe (0)

In Klipper Settings (pressure advance calibrated - use linear advance in Marlin)
Smooth Time (.037)