Axe Y Mise à niveau complète

Y-axis tends to be quite woobly in 3D printers with 8mm rods. Here you can find every part you need to make your Y axis sturdier with 12mm rods and linear bearings.
This is for printers like the Prusa i3, mk2/mk2s or similar.
You can upgrade your printer linear axis or your bed size as well, changing your traditional 20x20cm heatbed for the 30x20cm one, you have both options. Regardless your choice, you will notice improvements on the linear Y axis, plus your autolevel features and first layer will also be enhanced.

Materials:

-2x 12mm (inox or silver steel) rods with 35cm length for the traditional 20x20cm heatbed OR 50cm length for the longer 30x20cm heatbed.
-Heatbed base. You can cut it in 3mm thickness aluminum or 8mm thickness acrylic/empack P.P./plywood. DXF and DWG files.
-4x LM12UU linear bearings. https://www.sun-bearing.com/linear-motion-bearings/high-quality-exquisite-linear-bearing-lm12uu.html
-2x M3 screws, at least 4mm larger than the ones you use for your y-belt-holder. Or even longer depending on your new heatbed base thickness.
Some zip ties.
-(Optionals) 2x M2 by 10mm long screws for attaching your endstop to the motor mount part (printing "y-motor.stl"), 1 little limit switch with lever and maybe more belt if you upgrade your bed size.

Instructions:

1) Print "y-corners 12mm.stl" x4
2) Print the correct y-belt-holder.
-You can even use your current y-belt-holder or print the Prusa MK2s original "y-belt-holder.stl" which is very practical to mount. They all have the same 41mm separation between the M3 screws. In this case you just need to print "y-belt-holder adapter 4mm.stl". I recommend this if your endstop doesn't reduce travel length in the rods. You can always cut longer 12mm rods to fit your needs if you don't want to change niether your endstop location or motor mount part.
-If you want to upgrade your endstop location so it doesn't interfere with the Y axis path, then you can print "y-motor.stl" to place your endstop, and "y-belt-holder endstop 20.stl", that way the y-belt-holder will trigger your endstop in the exact place.
-If you want to upgrade your heatbed size too, you should print "y-belt-holder endstop 30.stl" because the trigger point changes.
-If you have sensorless homing or your endstops well sorted out, forget this and number 6 steps. Go for the little 4mm adapter to use with your y-belt-holder and get longer screws for it.
3) Disconnect your Y axis hardware and unmount your Y axis.
4) Replace your parts for the new ones and make sure everything is correct and square. The new 12mm rods should go all the way in the y-corners parts. Don't zip tie them just yet.
5) Prepare your new heatbed base, placing and securing the new 12mm bearings with zipties in the middle.
6) Screw your endstop in the motor mount part.
7) Screw your y-belt-holder in place. The longer side of the part faces the Y motor. Slide the heatbed base in the rods and make sure the part triggers the endstop right where the linear bearings collide with the y-corners to maximize your Y axis total movement. Correct if necessary leaving 1 or 2 mm of room and secure your y-belt-holder tightly in place.
8) Install your belt and cut any excess.
9) Prepare and install your heatbed and you are all done, you can ziptie your 12mm rods.
10) After that is just software parameters.

Notes:
-If you have sensorless homing everything is much easier because you just need to print the 4 new y-corners with the 4mm adapter and cut your heatbed base file.
-Your Z axis total dimension will be reduced by at least 3mm, but it will be more if you cut the heatbed base in 8mm thickness. I recommend to have it done with 3mm aluminum to maximize your dimensions.
-All parts are modifications from the original Prusa MK2s printable parts, you can find the original y-motor and y-belt-holder for instance.
-The y-corners need simple s.
-"Heatbed base 20x20cm" is compatible with most 20x20 heatbeds like MK2, MK2a, MK2b or MK3 aluminum
-"Heatbed base 30x20cm" is compatible with most 30x20 heatbeds like MK3 aluminum 300x200. See RepRap website https://reprap.org/wiki/PCB_Heatbed#MK2.2C_MK2a
-If you need a heatbed base for a different size and your printer is compatible with this upgrade, make a comment and I'll it.

Print with ABS