I printed it in PETG. The spiral didn't turn out perfectly cleanly. That was more likely due to the supports. I didn't want a separate piece of PLA for each support as a separating layer. That would have simply created too much waste. I also quickly made a reducing sleeve, but I made the tolerance too small. In the end, it was a perfect fit. An initial practical test in italy on the beach showed that it's much faster to dig a hole in the sand and bury the whole thing than to screw it in to the Sand.