A spike that pushes into the soil and takes a plastic bottle neck-down, so a pot waters itself slowly through side seep holes. The STL as supplied measures 26.0 x 26.0 x 95.0 mm. It prints flat with no supports, in PLA or PETG. The editable OpenSCAD source is included, so you can change the top opening and the buried tip diameter and export a version sized to your own space. Files included: STL, 3MF and the .scad source. Printed at 0.2 mm layers with three perimeters it is strong enough for daily use.