Not trivial, but not impossible either. Usually though the product would be designed in some CAD program, and when the shop customizes measurements they adjust them manually based on copies of the model. The "pro" way would be to have a parametrized version, but it's also trickier to create. I'm not 100% sure, but I'm getting the vibe the author picked up modelling/3D printing as they went along, so the easier route would be hardcoded values changed for each customer.
alt Hacker News
Not trivial, but not impossible either. Usually though the product would be designed in some CAD program, and when the shop customizes measurements they adjust them manually based on copies of the model. The "pro" way would be to have a parametrized version, but it's also trickier to create. I'm not 100% sure, but I'm getting the vibe the author picked up modelling/3D printing as they went along, so the easier route would be hardcoded values changed for each customer.