Bird feeder for the window with swappable tray

I changed the Orginal design to fits 3 suction cups for better stability furthermore I added 2 dovetail slideways in the design so you can slide the trough out for cleaning purposes. It snaps in to place with 2 mechanical locks I integrated in the slideways.

I bought the suction at rossmann they are normaly used as hooks for the bathroom . One of the pictures shows the dimensions of the holes for the suction cups. 

As material choice I recommend PETG because of the UV-resistance and the greater flex for the locking mechanism.

Suction cups from Rossmann

https://www.rossmann.de/de/haushalt-flink-und-sauber-saughaken-mit-metallbuegel/p/4305615394619

I will ad a version with bambu Maker’s Supply if the suction cups cups arrive from them.

So it will be easier for you to source that parts.