Water tray for half size seed germination cell insert

This water tray or drip tray is something I designed years ago to allow me to germinate seeds on a windowsill before it is warm enough outside.  Once they weather has warmed and the seeds are growing I move the seedlings outside and then into raised vegetable beds.

I use half size cell inserts as my windowsills are not big enough for full size cell inserts.  These are deliberately designed to be as small as possible, the inside of the water tray is 200mm x 150mm.

I originally printed these in PLA but they did warp after a couple of years in the sun.  I now print them with PETG and that works well.