I like printing them so I can draw and write all over them.
I use b&w laser at a minimum.
When representing a lot of information on a diagram though, color is helpful to have. I've been looking to move to a color laser printer. What is important to look out for is that you find a printer that prints all four toner colors through one pass in the drum. Most of the cheaper laser printers send the sheet of paper through up to 5 times, once for each color plus black. This uses up the drum in your printer much faster.
For any printer you look at, be sure to calculate a cost per page including toner and the drum. If you can find a printer model a few years old for which third party toners exist, look at that carefully. I know that Brother and Okidata printers are great for business/spec type printing and have the lowest toner costs on the market. My next printer will be one of them.
Beyond that, try to find a printer that:
- is network capable (wireless is a nice to have)
- duplexer is a nice to have. I like to use the backs of the sheets to take notes on the printed sheet next to it.
- has multi function capabilities. I live by my fax to email scanner. I email it into my case manager and title it appropriately and file away the paper. if I need it again, I can print off the PDF again.