Producing a model or prototype will allow you to find the best approach to manufacture the device you've invented. It can be ideal for almost everything like determining where you should put labels, what are the shipping weight is going to be, how to best package it, what it might cost to produce it, and also to get feedback from test users. It is a valuable tool to work with.
If you are intending to try and raise money to manufacture the newest product yourself, or maybe you're demonstrating it with a potential consumer to obtain a big order, you will need the prototype if you don't currently have a production unit to exhibit or demonstrate.
People just don't have much imagination. You are an inventor, and that means you will have an imagination. One which just invent something you want the idea...and it takes imagination to generate fun new ideas. Other people, you will discover, simply do not have the imagination or vision that you just do. Help them out.
With a decent prototype or model, your audience needn't have an imagination. It can make cool product "real" on their behalf, adding tremendously in your credibility. Having a good prototype can help sell the merchandise even when it isn't during production yet.
DON'T postpone prototype building until when you file your patent application. You will probably discover flaws or new features, or discover possible manufacturing problems. With rare exception prototyping is very worthwhile. You will find almost always unexpected discoveries from construction of InventHelp prototype.
Exams are essential. A prototype allows you to actually try out your invention in the meaningful way. You can look at it with individuals other than yourself if appropriate, and you will probably find that other folks will have constructive criticisms and suggestions that could be very valuable.
By searching online you will find model and prototype building companies who are able to build it to suit your needs unless you have the skills yourself.
There are instances when a prototype just isn't practical, if it's very costly for instance, however, if it's you can, I recommend an invention prototype or model be generated.