We just updated our printers and have 1 printer that is always available (1 day delivery) and 1 printer that is more busy and has a delivery time of 3 days.
This means the prices for these printers are different and we want clients to be able to choose between a fast delivery with higher prices, or a slower delivery with lower pricing.
On the overview page of 3D hubs this seems to work fine with a "from: " pricing and “1-3 days” delivery time. However, when actually submitting a print a client can select materials, which makes the price switch automatically to the 1 day delivery printer with the highest price.
We would suggest letting the client make this decision. Do they either want a quick delivery, or a lower price.
It would be nice as well to have like a checkbox or something for a client to be able to choose rush printing and have it automatically add a percentage to the charge. For example I have two main printers, but in order to charge extra for a rush job I have to list a completely different ghost printer with a higher price.