I am certain this has been requested before. I just want to enter my vote for either a 1.75 filament model or an option to convert an Ultrimaker model. The last time I shopped for a new printer (1 year ago) I ended up with a Prusa MK3. I have no regret as it has perform very well. However, I would love to have an Ultrimaker with the dual head. There are certain designs where the dual head would be ideal. To Ultrimaker, I would think offering such an option would definitely increase your sales as I am certain there are many potential customers like myself that are looking for this option.