You have a near-production version of the item. Should you now begin making at scale? Not yet! Your last prototype isn't developed for manufacturing (DFM). You require to take into account the points listed below in addition to the fabrication, processing and assembly. Your final model might be utilizing parts that are affordable in order to produce a couple of models (e. g 3D printed parts or Arduino boards), however not cost-effective for mass production.
The metal and plastic components and casings require to be optimised as part of DFM in order for production in large volumes while preserving consistency and durability/strength. Much like DFM, preparing for DFA (Design for Assembly) early on during product development can substantially impact cost, quality and timelines. You should design products such that they can be put together from beginning to end efficiently and cost-effectively.
The general design ought to be done keeping assembly in mind and must be done to relieve it. Think of methods to minimize complexities during assembly and disassembly. How will build a prototype be accumulated and transferred on the assembly line? What can be avoided? Screws, adhesives, sharp parts, Can the parts be standardised? Can you utilize modular styles? Avoid parts so little that they can't be understood or controlled easily.
This is the closest you have got to the real product and is the biggest step in the entire product advancement process. This production all set item should be good for financiers to understand the item. If you have enterprises/businesses as your clients, you will understand that it might take a number of weeks to close sales.