A pot extender is a handy tool designed to support the growth of aroids, especially anthuriums. These plants often have extensive root systems that require plenty of space to thrive. A pot extender fits onto an existing pot, effectively increasing its height without the need for repotting. This gives the roots more room to grow while maintaining the current aesthetics of your planter. Use with sphagnum moss or other preferred growing medium.

You should be able to rescale to your needs, 60x260mm and 70x250mm sizes fit a typical 220x220mm bed size.
 

My settings:

• Material: transparent PETG
• Nozzle Size: 0.8mm
• Layer Height: 0.4mm 
• Walls: 1 or 2
• Bottom Layers: 1
• Solid infill parallel to a longer side of a model (important)
• Supports/Brims: none