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Unfortunately, as far as Waterpiks are concerned, I live in the UK where they are rare and consequently rather pricey.

Thanks for the replies. Before investing in a Waterpik (which might cost more than a replacement print head), I'd like to know if I'd be "flogging a dead horse". How does one tell from the patterns in a nozzle check whether the problem is a blockage or an electrical fault?

Thanks, The Hat. I've tried as you suggested and the nozzle check was worse! Your diagnosis is looking highly likely so another print head is on order. Hey hum.

Hi. As you can see from the attached nozzle check, the Cyan and PGBK on my ip8750 are partially blocked. I use compatible carts and inks from Octoinkjet. I've tried: Canon (software) cleaning Soaking the print head overnight in the Pharmacist's solution (3% glycol, 20% isopropyl, 77% distilled...

Canon PIXMA iP8750 will print on disks. It will also print up to A3+ paper sizes. I run it using refillable carts & inks from Octoinkjet which makes it a lot cheaper to run. I find it produces high quality prints (for the money) and I love it!

This is a (colour) scan of a 4x6 (colour) print of a B&W test image. I can see a tiny hint of colour in this image that I cannot see in the print. Your trained eye would undoubtedly see things I can't, though!

It does to my untutored eye. It's marginal, though, and I'm sure both printers would benefit from PeterBJ's tweaking techniques. Thanks for the link. I've got a lot to learn and try out - I need (another) rainy day! In any event, I'm very happy with both printers. The 8750 is more aimed at...

Yep, +20 looks about spot on, thanks.

Wow! What a difference! +30 might be a tad too much but I'll carry on experimenting. Thanks for the tip.

Thanks, I did wonder! I'd love to correct it but please would you repeat the link as I couldn't get it to work?

I have an ip8750 (used predominantly and regularly for 4x6 snaps but up to A3+ occasionally) and an mg6650 (used for office documents, usually A4, and envelopes etc.). Both printers use the same 3rd party carts and inks from Octoink (which are great, BTW). I am a rank amateur hobbyist (colour...

That's interesting. I thought the 'K' cart in both 6820 and 8720 is black ink. Is it ineffective in B&W prints?

UPDATE: Just to add that Wex Photographic in UK has "Save 10% on all Canon Printers over £99 with Code PRINT1015" until 30th Nov 2015 and Canon UK has Cashback offer on selected printers until 13th Jan 2016. This includes £30 on the iP8750 so you can get one from Wex for £149 (net) this month...

I had a Pro9000 mkII. As a retiree, it was a great pass-time - buying empty carts off ebay, learning about purging, refilling and smugly printing cheap A3+ colour prints for my friends and family. Our walls are plastered with large prints of our grandchildren that bring us joy wherever we turn...

Thanks, Hat. I'll give this a go next refill. Andy

I run 2 Canon printers (Pixma iP8750 for photos & Pixma MG6650 for documents) and I could not be happier. Both printers use 550/551 carts and I have used after-market ARC carts and inks from Octoinkjet from the start. What is the life-cycle of after-market carts? Do they need to be purged or...

They seal the vent hole when the cart is not being used in the printer (just the same as the tape over the vent hole on bought/OEM cartridges). They don't really need to be coloured.

Thanks, Joe, but this is incorrect (for these carts, at least). The white plug is in the fill hole and the coloured plug is in the vent hole. I contacted Octoinkjet, as suggested by PeterBJ, and got the following response: 1. The vent plug is the one that sits over the sponge part of the...

http://www.octoink.co.uk/products/PGI550-%252b-CLI551-Refill-Kit-Bundle-inc%27-Grey-%5B6-x-125ml%5D.html

The refillable carts have arrived but without instructions. Each cart has 2 plugs - a plain one in the reservoir (for refilling) and a coloured one (coded to match the ink colour) above the sponge. Should the coloured plug only be used when storing filled carts (the equivalent of tape on an OEM...