Created a tank key for IDO Seven D toilets. Fits to the toilet's two sided flush button and opens the rod that needs to be remove before opening the tank.

Has a 15mm hex, with a bit holder at the bottom.

IDO Z6205700001
IDO 5731280

WC tank key.

The smaller version worked great for me. The longer version might be a bit easier to use.

An original version of this costs a whopping 19 € in Finland for a little plastic hex key.

Only printed the shorter version.
Printed with following settings:

• 0.24mm layer height
• 15 % infill
• 5 bottom layers

I used no supports but I do recommend using supports.
Bambu Lab P1S managed to do pretty well without supports.