Other than that, you are more expensive than hiring a machinist the old-fashioned way for one-off parts. Apparently I just don't understand your business, because I'm clearly not your customer.
Also please don't name drop your investors - nobody cares. Funding is a vanity metric. Focus on how you can be profitable when your business is no longer subsidized by external funding - that's what will make you successful. Growth is great but it doesn't help if you can't ever sell at a profit.
Anyway, while I may not understand your business, I wish you luck. If you can truly revolutionize manufacturing the way you say that would be great.