Reptile / Gecko Feeding tray (Magnetic)

My Girlfriend Tasked me with designing a feeding tray for her new crested geckos and i decided to make this using spare magnets i had laying around from the local hardware store on a previous project. She got tired of the suction cup ones from the reptile store falling off because of the moisture in the tank so, we went with magnets. I understand that the magnets are exposed for the feeding tray side and hope to design/3d print/ apply a sealant over them to increase the life span in the next version but this was a temporary fix till she gets the next biome made. She just wanted anything not suction cup style so the geckos dont fall while eating I printed this using pretty much factory anycubic slicer settings, i just added supports for the over hang The magnets are 18mm x 3mm (.709in x .118in) My Kobra S1 only needed .1mm (18.1mm) of tolerance to get these to work but i super glued them in just to be sure. this was made to hold the little .5oz plastic souffle cups you can find locally or online. The Diameter before the lip is 40mm and the lip just sits on top of of the tray I am still self teaching myself cad softwares so please bare with me