Dual Y Linear Rail on ender3pro/3v2 style printer with 4040 extrusion - revisited (Patreon)

I had a couple people with binding issue with the previous model so I created a slit model that interlocks loosely just to help with installation. Playing it safe.

To which I also added an ADXL mount by request (15mm spacing screw point), so should work with most generic ADXL and likely the BTT usb adxl v2

Had another request to make it back a single piece version of it with the adxl, so I also added an extra 0.1mm tolerance to possibly take care of the binding issue on some setup.

use 7~8 perimeter wall for strength, and +30% infill

Four M5x12 + stock locknut
Eight m3x6 for the linear rail block
m3x6 for adxl + two heat inserts M3 x 4mm Length x 4.6mm OD or 5mm OD

- slide in the nut, screw the M5 temporarily to lift the nut as they are positioned on top of the linear rail
- secure the rail block
- if using adxl, now might be easier to install it
- remove the M5 screws (the nuts will sit on the rail temporarily without falling off)
- place the bed under platform on top and secure with M5x12mm screws

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if you still have some binding issue, to "parallelize" (not sure that's a word) the rails, one thing to try is to loosen one rail t-nuts just enough that it can move with friction but otherwise stay in place, move the carriage back and forth, then to one end and secure that end screw, then to the other end and secure that end screw, and secure the rest.