Chicker feeder (rat proof, auto closing)

When the chicken step on the flat part, the chicken feeder will open. When the chicken leave, it close.

I just upload the files, I hope the pictures will be self explanatory.

There are 3 collars, each in 2 parts A and B. As you can see in the pictures, one at the bottom, one in the middle (yellow in some of my pictures), and the last one on the upper part (top).

The last printable part is the cover.

Assemble it with M3 or M4 screws.

Use L metal profile and flat aluminium profile (see pictures). 

Use 10cm PVC pipe and assemble the parts together.

I used a flat white aluminium for the step. On the upper side I glued some wood, and I screwed it to the L aluminium profile.