ip8750

I am having an issue with my printer Canon iP8750. The last cm or so of prints are not printing correctly and look extremely grainy as you can see below. What is causing this / how to fix? I am printing via Lightroom on a Mac on Matt 230gsm paper by Fotospeed & Marrutt. Thanks

Hi! I have just purchased this, print quality is great. I read the spec as wanted to make sure it would print 8x6 (A5) and it said it did, however this option is not available when I send to print. It jumps from 5x7 to 10x12....any ideas how I can get 8x6? Many thanks in advance