This is where things can get hairy as far as the amount of time these tools are taking from your core skillset as a designer or engineer keeping the lights on and hopefully profiting as a business. Unless you have experience with these machines in a hands-on setting, then you are going to be up against a learning curve for a period of time. This is the biggest reason 3D printers in particular sit idle and unused. They are great tools, but it is not like operating a Xerox printer and these machines can be frustrating.
Make sure you talk to someone who operates this machine regularly BEFORE you purchase so that you know what you're getting the company into. It may sound great on paper and the savings vs. outsourcing should provide a compelling case, but there are hidden costs in maintenance, troubleshooting, and material inventory that should not be discounted . This is why I recommend small businesses and teams rely on outsourcing with an experienced partner who can provide access to a range of technologies, machines, materials that you wouldn't have access to otherwise.
If you have the time and technical skillset to operate that printer or laser or cnc mill, then do it, but for many businesses it just doesn't make a lot of sense.