I've Made this carriage with the intention of using 2 x MGN Linear Rails and MGN12H carriages to replace the standard V-Slot system on the Y axis.
You'll need two of them.
They allow a totally reversible linear rails upgrade for the Y axis on the D9...
Fits the printer and works perfectly
you can even re-use the original limit switch by screwing it on the side of the 2020
After a few weeks of being on the printer, there's a subtle improvement on the smaller stuff I've printed, mainly the front and rear of prints, the vertical faces are definitley straighter, the layers stacked on top of each other in a more uniform manner!
Noise is slightly reduced I think.
X axis rails
X axis tensioner
X and Y axis belt improvement to reduce ghosting!
3D Filaprint Premium PLA only for this prototype
60% or higher as it's a structural part
Suggest using something better than PLA for long term usage
The 6mm Holes on the 'underside' (which becomes the top as this is printed upside down)
seem to sag a little unless you have decent cooling. you may chose to use supports for a cleaner finish, mine did OK with no supports.
Bill of Materials
This is for 2x carriages
2 x 500mm MGN12 Linear Rails
2 x MGN12H Block
6 x M3x16mm allen head bolt
4 x M3x12mm
8 x M3x8mm (re-use from the original Wanhao carriages)
10 x M3 nuts
You can use slightly longer / shorter - the carriage itself is 11m high and the bolt needs 3mm extra for the base plate
In addition.....to hold the MGN rail to the 20x20 extrusion
6 x M3 20x20 profile T Nuts - 6 minimum (more recommended)
6 x M3x8mm allen head bolt
And, further stuff IF you decide to replace the extrusion also
8 x Right angled 2020 rail joiners - I had to grind the tabs off one side to make them fit well
8 x 2020 M4 or M3 T Nuts
8 x 4040 M4 or M5 T Nuts
16 x M4 or M5 x 12 Allen Bolt head screws
Remove Y axis Bed
(unscrew bottom, unplug the TEmperature sensor and unscrew the two power terminals)
(unscrew two allen bolt screws holding the belt in place on the underside)
Seperate Heated bed from Y axis plate
(remove all 4 thumbscrews, careful not to loose the springs)
remove old carriages from Y axis plate
(unscrew 10 x M3x8mm allen bolt screws)
Use screws to mount Hiwin blocks to new printed carriages
Slide T Nuts into the existing 20x20 extrusion that supports the wheels when the bed is mounted. At least 3 per side, top, middle, bottom, more is preferable for a very firm hold.
Slide block/carriage combo onto new rails
Slacken off the two screws holding the 20x20 extrusions to the 40x40 extrusion
add carriages combos to rails
add y axis plate to carriages (still leaving the 20x20 extrusions a little loose)
Tighten up carriage / y axis plate and slide all the way forward
tighten one side of the 20x20 extrusion a little
slide the y axis plate all the way back
tighten the other side a little
repeat the above until the bed is moving perfectly front to back
You lose about 5mm of build height with this mod