What options would you purchase with Core One?  

RE:

If you are brand new, the PEI sheet with a few roles of PLA to start with.  You don't really need filtration unless you plan on printing ASA, PA etc. If you are buying the kit then I would definitely recommend the accelerometer to properly calibrate the input shaper and motor phase stepping. Otherwise, if getting fully assembled you could skip it. I do recommend getting the kit. It's really not that hard to assemble from the kit and you will learn a lot about the printer in the process. Some extra hot ends and nozzles would be a good purchase. 

RE: What options would you purchase with Core One?

It really depends on what you want to do. 

The combination you've suggested indicates that you're concerned with the appearance of the prints (textured build plates and accelerometer). If so, you may find yourself wanting higher detail such that a 0.25mm nozzle could give you better results in small items. 

For myself, I mostly print mechanical parts in ASA, so I might benefit from the filter. Maybe I'll give it a try some day, but I don't find the styrene odor gets anywhere near the level of "irritation" that California associates with a dangerous 100ppm level. (I'm also unsure why we'd want to turn on fans while printing in an enclosure we're trying to keep warm.)  I do find a 0.6mm nozzle helpful for larger parts and slightly better layer bonding (because of the larger melted surface).

RE: What options would you purchase with Core One?

Accelerometer from Prusa, maybe GPIO if you are planning to go crazy modding out the printer.  Agree with David for 0.25mm and 0.6mm nozzles -- buy the CHT high flow versions if Prusa is selling them, if not, definitely buy the E3D HF0.6mm - not the plain 0.6mm. You can probably get by with a lower flow 0.25mm. And you may want to consider getting a hardened nozzle; tho the E3D HF0.4 Obxidian is available from Amazon (no duty). 

Then buy a third party textured sheet from Amazon, they sell two sided textured, and ones with smooth, CF look, Star look, plus the textured surface. For whatever reason they hold PLA better, and last as long. I just bought three, all from different vendors, and they look like they came out of the same factory.

RE: What options would you purchase with Core One?

Hi Neil

I bought a list of options over the year leading up to ordering the kit to spread out the costs, but also could because the kit queue was ugly initially. Of those, the things I've actually used are:

• Smooth (not so much) and satin (nearly all the time) build plates
• Accelerometer, because I bought a kit. It's only used that once for calibration therefore buying a built printer will not need that
• standard 0.4HF, hardened 0.4, and the 0.6HF nozzles. The hardened was for PETG-CF and since that's not in your list, you can go without. The 0.6HF does have a beneficial impact for speed where detail is less important, but I also found for transparent materials if you're looking to do any of that.
• BIQU cryogrip build plate (a few times, esp with silk PLA which I had some failed prints of plates of heaps of small items on a single satin plate). I'm glad I have this option, though I'm certain re-printing with brims on the satin would also have worked fine.
• Buddy3D camera. It's not outstanding, but my C1 lives in the garage so a way to see failed prints to stop them before they cost me huge in filament was a priority for me. It's mostly fine. I'm glad I have it, but there are other options if you have a camera already, or will be sitting near where your printer runs.

The other items I have which will be used in projects that are planned, just not yet, are the 0.2mm nozzle, GPIO board (longer cable on order for where I'll be using it), and the advanced filtration kit which I bought knowing of a future project that will use smelly materials

I also bought a filament drier as early prints were PETG, PETG-CF and transparent.

Of the accessories I have, I have not yet found a reason to use the textured build plate so that's the one I'd possibly suggest dropping off your list, but YMMV.

HTH
Geoff

RE: What options would you purchase with Core One?

Accelerometer, because I bought a kit. It's only used that once for calibration therefore buying a built printer will not need that

update:

I have an assembled printer and my Accelerometer is on order because I need to recalibrate after belt retensions and often wonder if a factory cal was negated by 12,000 miles of shipping jiggle.  It is cheap insurance. Plus, several people who have used it say they had to change the calibration frequencies from the defaults and got better printing results. 

Textured sheets are best for PETG and FLEX filaments which can destroy the smooth sheet. No experience with the CryoGrip sheets, but probably an option. 

RE: What options would you purchase with Core One?

A lot of good information already. Start with PLA because its the easiest to get good results with.  I strongly recommend the satin print sheet.  I have the smooth, satin and textured  and I use the satin with pretty much everything except ASA.  I also recommend the accelerometer option.  

Not directly related to the printer itself but if your new to 3D printing your also going to need a dryer of some type to dry the filament.  To start with simple dryer that you can also feed the filament from is a good starting point.  A way to store filament to prevent moisture absorption is also a good idea.  Not sure what to suggest here, I have used the vacuum bags with mixed results.  Lastly 99% IPA for cleaning the print sheets between prints.