What is the difference between Hp Indigo and Konica Minolta BizHub Pro C6500?
Both are made for Digital printing... Laser or Ink jet? Do they have same technology?

Very different issues at play as the Indigo uses liquid ink and the Konica dry toner.

The Konica Minolta C6500 is compared to canon and xerox color copiers / printers. The 13 x 19 paper size from all drawers and speed for machine price make the KM stand out to me vs. the current canon and xerox models. Also the fact that the main unit is part of a system that takes you to the top of the KM line so you can get the basic engine that is part of the big light production unit for a low entry level price, leading me to believe the basic construction is going to be quite well built.

The indigo is different than an inkjet in that it uses laser to control attraction to a photo imaging cylinder (PIP) from ink rollers (BIDs) which then transfers to a blanket cylinder with paper around an impression cylinder. But it's a more difficult machine to get your feet wet with than a KM with a higher price and 5538 lb weight vs. ~ 800 lbs for the KM. Interesting indigo possibilities though include 7 inks for custom ink colors. But you can get a new KM for the price of a well-used indigo or a few KMs for the price of one new indigo.

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A new indigo is on-par pricewise with an iGen or NexPress. You can get an older-model indigo well used for the price of a new Konica Minolta and have better print quality, but will you be able to get a maintenance contract on the used indigo? HP is also increasing service costs on the older model indigos trying to get them out of the market. And if not, you will need to have a lot of experience to maintain them (more than even a toner based press IMO). It's tempting to get the used high-end machine that also sets you apart in a specialty niche from the copy shop down the street, but it's easier and probably more logical and profitable to get a low-end machine that you can afford new with full service if you want to make money from the machine running day in and day out.