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My little one got a crayola melt’n mold factory the timmer has stop working witch lock the toy and now i can’t get it open.. so i flip it over to see what i need to use to open it up and replace the broken part.. but its a odd shape.. it looks like a rectangle that been divided in half..does anyone know what tool i need?

I not sure this is the same model but it might give you some help. There’s very little info on this machine out there: Crayola Crayon Maker Repair

Hex sounds like a proprietary security screw. Post an image of it with your question. Use this guide Adding images to an existing question for that. It will allow us to see what you see.