My favorite, don't know if anyone's used it on the SD3 since the wires are routed through that hole now.  If you drill a hole in your case or in whatever enclosure you use this can be fitted on anything with a big enough hole.

I was unaware the filament cleaner helped so much. I have 2 nozzles that need unclogging

this has me interested also.  I've been printing pretty much non stop for two weeks now and had no idea i needed to clean the filament as it was being unspooled.  is this an issue with all filaments or just certain brands?  Right now my 2 spools are from sainsmart.

Right now i am still looking for a good way to clean my filament :-(

It would look uglier, but I could modify my filament guide to have a slot where you put a bit of foam. If anyone wants that, let me know.

Otherwise there are quite a few filament cleaning things on Thingiverse.

Right now i am still looking for a good way to clean my filament :-(

After that an extruder replacement. For many, it's only a matter of time before the acrylic jigsaw breaks.

1/..   print a filament cleaner/ dust remover before any other thing...if you didn't want to clog your extruder.... [search for universal filament dust remover on thingiverse]

I've only been around a few weeks, but I've started to get a feel for things and I think this may be a good starting point:

1) **EDITED** Add a filament dust remover and a filament guide of some sort

Thingiverse: http://www.thingiverse.com/search?q=fil … st&sa=

Thingiverse: http://www.thingiverse.com/search?q=sol … de&sa=  (I like my own clip-on design best, but I am biased)

2) Build an enclosure
3) Upgrade your bed to glass or ceramic, this may require modifying the adjustment screws and possibly making some clips.

Thread: http://www.soliforum.com/topic/160/glass-bed/

4)Cable management, either a 'cable snake' or a clip on guide for the frame.
5) Add a filament 'wiper' to clear the nozzle before a print job starts
6) Upgrade your Z axis with M5 rod, this is getting more advanced and will require disassembly of the Z-Axis and purchase of assorted parts.  (a definitive guide with parts list and suppliers in different countries would be great)
7) Upgrade your print head bracket to an ABS one, I believe it's called Lawsy's Mk5.
8) Print replacement parts for the X and Y carriage, again, this requires a teardown and confidence that you can rebuild it.

Thread: http://www.soliforum.com/topic/2813/pri … -consumer/

9) Add a fan to your extruder to cool printed plastic.

Thread: http://www.soliforum.com/topic/3045/mk5 … -consumer/

10) Add fans to your stepper motors
11) Replace your HotEnd, possibly with an all metal one that can print different materials at higher temps
12) Upgrade your Power Suppliy
13) Change your electronics

I'm sure there are others, and this list needs some more links, but IMHO these should all have their own stickies. If there are better guides than thos I list, or other specific mods, please add them here and I'll update this post.

Useful things:

a) You may also like to get a Pressure Gauge and build a mount for it for bed levelling, this is more of a tool than a mod.

Thanks in advance guys.