It's an understatement to say that Anet A8's acrylic frame is weak...
Here is a carbon "exoskeleton" to add an incredible stiffness to your printer and thus reduce z-wooble caused by X axis shaking the frame.
I am an adept of KISS concept (Keep It Smart and Simple), you will need only one hour of printing to finish the exoskeleton which means very very few filament.
The stiffness is brought by 2 pieces of 6mm carbon rods or carbon tubes (go and search on ebay or in your local kite shop, you'll get them for less than $10).
If you don't get carbon rods, just use metal rods (steel or even aluminium) thy will do the job but in this case you need to add the middle junction pieces.
I join a not so good video explaining how to assemble it (sorry for the out of focus parts) https://youtu.be/Jiec6JPh0PI
I made it even stiffer just by adding a jonction piece where the rod crosses the vertical plate.
It worths to precise that those stiffeners do not interfere with the print area. the initial volume of 220x220x240 mm3 is fully preserved.
EDIT : you get also in a separate zip file all the STL to use with 5mm rods
I hope you like, any comment welcome ;-)
Direct print with no support.
You will need:
. 3x M3x35 (on the top and middle left)
. 5x M3x25 or M3x30 (on the bottom and middle right)
. 8x M3 nuts
Bill of material
- 2x 41,5 cm of carbon rod or tube with 6mm of outside diameter
- standard M3 screws and nuts (I had some spare from the ANET box)
finishing the pieces
The ANET A8 is quite an accurate printer once properly built and trimmed.
I designed the pieces with very few tolerance especcialy at the level of the jonction of the carbon tube.
Once printed just manually drill the holes with a 6mm drill so that you'll need a hard push to insert them (just look at the video you'll hear the stick and slip noise...)
That's all you have to do !
There is however a (small) drawback, you'll have to relocate the z-endstop for instance use this support : https://www.thingiverse.com/thing:2008349 .
The best way is to go to a z probe that has to be installed in front of the carriage.
Indeed, if you have installed a Z probe behind the X carriage (like the original anet's one) it may interfere with the carbon rods..
my other ANET A8 mods