[morsch]

I'd like to see your BOM. ;) I'd estimate 10-20 EUR for high quality paper; undoubtedly the ink supplied with the printer will not be enough to print 300 photos, that's another 40-80 EUR, leaving 50-100 EUR for the printer. Are the prints from a ~100 EUR printer really equivalent to professionally developed prints?

[GordonS]

And assuming the OP meant an inkjet printer, they'll probably go through 4 whole sets of cartridges to print 300 photos.

And they'll need to "realign the heads" and "clean the nozzles" at least 17 times, which will consume hours of your time, paper, and probably another whole set of cartridges too.

I battled with Epson and HP inkjets for years - I haven't looked back since I bought a small black and white Brother laser a couple of years back. No more wasting time, no more new cartridges every 5 pages - you just hit print and it prints.