January 23, 2026
Description
An plant pot insert / nursery pot / inner pot / liner pot is a draining pot one places inside a non-draining pot, so the soil is not water logged and can be easily emptied — small pot + water logged will kill a plant quickly.
There's no iso-standard of coffee mugs, but there is a de facto standard: they mostly are very similar in size and are likely some meaningless round unit in freedom units.
Mug pictured (~390ml) has an inside that is 83.6 mm width —I used the poking out part of the calibers for once, so satisfying— but the inner base is about 10mm smaller.
The insert is 71mm (73 width -1*2 margin). and 80 mm tall.
Two models: the one with the cone cutout is to make watering easier when the plant (sage) is established, otherwise water goes everywhere.
I use a nasty filament and the grid printed without supports fine (Sprite direct drive extruder on a most Ender 3v2).
License:
Creative Commons - Public Domain Dedication