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Since you upgraded the thermistor and heater block it might be that your temperature reading is now inaccurate, especially if the thermistor setting in firmware no longer corresponds to the thermistor installed. You might be printing too hot or too cold without realising it. If the old...

Yes, it does look like underextrusion. @The Hat did you replace extruder components (eg the gear)? It may be worth recalibrating your e-steps if you haven't already done that.

There's a very good Freecad course that has just appeared on Youtube:

I have this printer and it only has a rear paper feed (and a front CD tray).

I don't have an ip4700, but can confirm that the Gutenprint driver works OK on my ip8750 (I'm using Fedora Linux so can't comment on how it works under Windows). I use Turboprint (a commercial driver), which produces higher quality output than gutenprint.

Just a thought - and apologies if this has already been mentioned (or considered irrelevant) - but could the gasket around the PGBK inlet have been damaged or lost during the initial soaking?

Here's another good starting point:

As a fellow ip8750 owner I'm sure I would find your photos useful in case I need to perform surgery on it at some point.

I'm sure @The Hat has now mastered Freecad (and is using it to design something huge and dangerous) but for anyone interested, here's a friendly intro to Freecad that's just gone up: https://www.youtube.com/watch?v=6JOITgw_T1Y

Once you've created your sketch, you need to use PAD to extrude it into a 3D shape. Here is a good non-video tutorial for you: https://wiki.freecadweb.org/Creating_a_simple_part_with_PartDesign There are lots of other good text-based tutorials at https://wiki.freecadweb.org/Tutorials

@The Hat If you want to start with an image file (jpg, png, etc) you need to switch to the Image Workbench. Here's a good video to get you started: https://www.youtube.com/watch?v=pwvc2tD-0uM He doesn't show you how to scale the image, but that's done by clicking the "scale" icon (to the right...

Sorry, I'm not too hot on Windows (I'm a Linux user). Maybe not a bad idea that you can't use it yet because you really need to watch several videos before you even touch it, or you'll give up before you start such are its wealth of features. (Tip: stick with just the Part Design and Sketch...

According to their website it runs on Windows 7 and above: https://www.freecadweb.org/downloads.php

You can if you fancy a new challenge, but I find Openscad is quicker to use in many respects. Freecad makes it easier to add fillets and chamfers, and creating irregular shapes. It also uses a more 'conventional' approach to design with less mental gymnastics. I've just designed a part in...

I second that. I've moved from Openscad to Freecad for most things, the trick is to ignore all the features you don't need (about 90%!). Edit:

Thanks - I tried some test prints with Eventone and it's certainly an improvement (good enough for casual viewing), but still more visible dithering and loss of fine detail compared with Turboprint. Possibly because, unlike with the R2000, Gutenprint's Canon Pixma IP8700 driver is marked...

I use Fedora with a Canon photo printer (iP8750) with (to my eyes) very good results. However, I never had any luck with the the Gutenprint/CUPS drivers - the dithering algorithm just didn't seem to be up to it, similar to what you're getting. I had to resort Turboprint, which is a commercial...

I've done something similar with my 551s and they seem to be working OK. When refilling a cartridge for the first time, I like to start by slowly dripping ink onto the outlet port (about 2ml). This helps to prime the sponge between the outlet and ink chamber and also gives you an indication as...

It also might be worth running a PID calibration.

In my case wild temperature fluctuations were caused by the heater cartridge and thermister working loose and moving around during fast head movements.