That is the roller shutter bracket. My roller shutter was broken and I could not find any to replace so had to design the similar one.

The model is ok to print without any rafts/brim/skirt/ears (may depend on your adhesion). No supports needed.
I printed it with the following parameters:

Resolution: 0.4
Slice: 0.2
Infill: 35
Perimiters: 2
First/last layers: 4
Material: PETG