Storage box for extinguisher or other

I designed a storage box for our boat extinguisher. The internal storing space is 100 mm x 100 mm x 365 mm high. I printed it in ASA to resist better to UV and solar effect. I did use the Polymaker recommendation for the bed and nozzle temperatures. The fan is off and the printing speed reduced. The box is printed in 3 pieces. The bottom, the top and the cover. Even with the Polymaker recommendation there were some small thermal cracks that appear (aesthetic only) that I decide to fill and paint. A small curvature appeared with the ASA on the bottom of the bottom box and on the top of the top box and cover. However on the top, the curve on the box matches perfectly with the one of the cover. The cover fits and stays well in place.