Increase humidity of your plants ! For orchid is the Best!
You can control the degree of humidity by managing the amount of water, you can add just a spoonful of water or fill the entire surface. It all depends on how much humidity you need.
I equipped the larger tray with a small float to see the level even when the leaves of the plants prevent you from seeing well at the bottom of the tray, just attach a small piece of polystyrene to the bottom of the float (as you can see from the photos I cut a 8mm diameter cylinder, 5mm high) once the tray has been filled with a marker you can make a mark on the maximum level, so you can fill it every time without spilling the water.
The dimensions of the trays are: one 245x209 and the other 220x209. Both are 34mm tall.
I use them inside a flower box to keep my orchids well. They can also be used individually for a single plant. They have a very solid design and are really sturdy.
PRINTING ADVICE: I made sure to design the trays so as not to create cracks for water infiltration but it is still good to use certain precautions: