how to upscale a 3d file to match my measurements

[fred_dot_u]

@TayZc1, I found an amazon item that presents the dimensions: https://www.amazon.com/Pack-60ml-Syr.../dp/B07H3MH52R If you can confirm that these values match the item you have, it provides a starting point. Using the 20 ml model in the link you provided, I measured the opening for the syringe. It appears that the 20 ml syringe requires about a 21.5 mm diameter to fit in that model. The amazon link indicates a 31 mm diameter, which scales up by 144 percent. It's possible that you'd want to go a bit larger, perhaps 145 percent, but too much could create slop in the design. At least with upscaling a part, it becomes less fragile as a result. Using the 144 percent figure, I've scaled the objects using Meshmixer and attached them. Obviously, you'll want to ensure that the length is appropriate. That's a parameter I did not check. I'm hopeful that adjusting the inside diameter of the female portion will provide for proportional matching of the syringe.