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Hardware And Software

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Hello guys i have a question.
First of all my Anet A8 has not yet arrived and for at least a month now i have been researching about the A8 and the general software used in the 3D printing world like slicers and modeling software and firmware about the printer.
But my question as an electronics engineering student is this : Can i upgrade the hardware of the printer ?
I mean which extruders are compatible and what can i do after i get it to improve it ?
Could i attach a second extruder and modify the software to print dual fillament ?
As for the firmware of the printer my questions are listed bellow.
What firmwares exist?
What firmware should i choose for the Anet A8
Thank you in advance.

Wow thank you so much for your comprehensive answers i will now continue reading ;)

My advices..or what i use with good success and fun ...

But my question as an electronics engineering student is this : Can i upgrade the hardware of the printer ?
I mean which extruders are compatible and what can i do after i get it to improve it ?

You do not need a different Extruder.. As long as you are good with 1.75 mm filament and do not want to win speed contests.. all is good with the M8 Extruder.

Could i attach a second extruder and modify the software to print dual fillament ?

Yes..you can... but i would the buy a complety dual filament kit

As for the firmware of the printer my questions are listed bellow.
What firmwares exist?
What firmware should i choose for the Anet A8

2 ones : STOCK...which is good until you feel confortable enough to go for auto bed levelling and higher speeds.. at that point upgrade to Skynet Marlin

Keep in mind.. LOTS of things beeing rumoured around are esoteric or nonsense...sometimes driven by simple faults that users want to cure by tampering the machine...

Get it together..
Print some test prints until you feel comfortable with things..
Start with PLA and glue stick directly on the plate at 70 degrees...

Print the usual upgrade parts to get it more stiff and easier to handle
pin it to a wooden plate
print and attach some sorta anti Z Wobble kit and some sort of Z axis endstop improvement..
Look for a housing...before you get mad with ABS fails
Attach a glass plate 3mm loosely to the heatbed..and some sort of isolating under it...
Isolate the nozzle with a coat from heat resistan fabrics or sllicone
Get ready for auto bed levelling

and and and.. piece by pece ..little by little only do next step...whe you feel comfortable to avoid mistake layering

have fun...

The one thing that I found helped me alot was this a M3 Pan Head Phillips Stainless Steel Screws Bolts Nuts Lock and Flat Gasket Washers Assortment Kit. Check Amazon or Ebay. I used a washer on every screw in the kit (as acrylic is fragile, and a washer spreads the force out over a larger area thus reducing pressure). The longer screws were great for mods. You will get some extra inside your printer, but this really helped out.

Here is what I used:
https://www.amazon.com/Glarks-280-Pieces-Phillips-Stainless-Assortment/dp/B01G0L1JRA/ref=sr_1_4?s=hi&ie=UTF8&qid=1491569637&sr=1-4&keywords=m3+pan+head+stainless+screws+kit

This is the official page for Anet A8:

https://www.facebook.com/groups/1068531466501015/

Look into getting:

A MOSFET Board (or making your own) for the hotend - this is practically a requirement to keep the motherboard from overheating. Fiberglass belts.

OctoPrint/Octopi (Octopi is just a fully configured OctoPrint - it's what you want):

http://octoprint.org/download/
http://www.instructables.com/id/Newbies-guide-to-Installing-configuring-Octoprint-/

Here is what I use for tensioner mods (upgrade the belts to fiberglass ones, be sure to get the same size and number of teeth as the current belt):

For the Y:
http://www.thingiverse.com/thing:1683085

This is required for the Y tensioner above (to prevent the tension from cracking the frame):
http://www.thingiverse.com/thing:1430727

For the X:
http://www.thingiverse.com/thing:1683070

For the Z (not really a tensioner, but helps with leveling):
http://www.thingiverse.com/thing:2172190

For the Z axis to make parallel:
http://www.thingiverse.com/thing:2170852

For Vibration:
http://www.thingiverse.com/thing:1672959

Good Reading:
https://www.facebook.com/download/preview/1759649107615235
https://www.facebook.com/download/preview/149582685524427

The cura document is for an older version, but it shows what each setting means and does. It's a VERY good read :)

What I am looking at for extruders:

I purchased an a Bowden J-Head Extruder from China, and I've been looking at this mount for it (completely customizable):

http://www.thingiverse.com/thing:2099577

Anet A8 Improved Y-belt Tensioner
Frame brace for Anet A8
by Simhopp
Anet A8 Improved X-belt Tensioner
Anet A8 Z Endstop Fine Tuner
Anet A8 Motor Mount Replacement (with Z Axis REAL Fix)
Anet A8 T corner
ANET A8 | Customizable E3D v6 Carriage / Bowden Mount
by TNS

You can upgrade or modify anything on it. You can print new mounting brackets for anything. You can do everything you mentioned. Search thingiverse for "Anet a8 extruder" and you will a ton of different brackets and other items.

The bowden j-head is very popular as it removes the stepper from the carriage, thus allowing for faster printing. There are titan mounts available as well.

Skynet3D is the most popular firmware, but there are others. Please follow the instructions for flashing the firmware carefully. Make sure your printer works with stock firmware before flashing it.

https://www.facebook.com/skynet3ddevelopment/

Thank you so much !!! I will now get googling :P