Small indoor LED grow light, built in watering port (front), excess water collection and evaporation vent (back).

Note my boat project has revealed some limitations with FDM plastics, mainly around water tightness. There are a number of different ways to get around this problem, dip exterior of bowl in melted paraffin wax (melts at 37 deg C) or coat exterior of bowl in epoxy resin.

BOM:

• Grow Light 3W 400-840nm (https://www.aliexpress.com/item/32814205527.html)
• Resistor (For my particular build I used a 1 Ohm 1 Watt but you may require a different setup based on your power supply) (https://www.aliexpress.com/item/32803425964.html)
• M3 X 3 X 5.3 Embedded Nuts: (old link no longer works - possible substitution M3 X D5 X L3) https://www.aliexpress.com/item/4000232858343.html
• M3 X 6 Machine Screws: (https://www.aliexpress.com/item/32798146322.html)
• An Appropriately Sized Self Adhesive Heat Sink (No part specified as sizing will depend on heat dissipation requirements and your specific operating environment - do not operate without a heat sink - for my build a 14 mm X 14 mm heat sink fit well)
• DC Power Supply 1A 3V (no part specified as you will need to use one appropriate for your region / local requirements). See notes below re: alternative methods to drive LED.
• Suggested alternate driving method vs resistor shown in post 1.2 V - 3.6 V input 3W LED driver - I think this has current limiting to 700 mA but as I've not used one myself yet you will have to do your own research on whether this is suitable https://www.aliexpress.com/item/33009837807.html

Update 3/15/2020 "iz kinda smol" - added a tall version