Prusa mk3 easy linear rail mod

Last crawled date: 4 years, 3 months ago

Linear rail mod for Prusa mk3
This mod use 300mm MGN12 linear rails.
No need to cut the rail.
The parts are design to match the original build height and movement spaces, so NO build volume lost and NO needed to modify the firmware. It will pass all the self-tedt calibration.
Easy to setup, the springs will keep the bed secure while leave the blocks some space to align itself.
You will need to modify the PSU holder if you have the old sliver-PSU
-> Demo video https://www.youtube.com/watch?v=MpT0MBIkZBg
Why
The Chinese liner rail is cheap and it much stable and quieter than the smooth rod - bushing combo.
The linear rail look neat.
Parts list
Bolts and washers
2x 300mm MGN12 rail
2x MGN12C block
1x MGN12H block(MGN12C will mork too)
14x M3x12 bolt
4x M3x15 countershunk bolt
6x M3 washer
14x M3 spring washer
4x 4x10mm spring (or can be cut from ball point pen sping)
4x M3 nut
4x M4 nut
4x M4 washer
4x spring washer
4x M4 T-nut
8x M3 T-nut
spring washer are optional
Printable part
2x head mount
6x node mount
2x node-bridge mount (need to be mirrored in slicer)
2x tail mount (need to be mirrored in slicer)(support needed)
Print with high resolution setting.(Printed mine with 0.12 layer height - Ender 3)
Installation
Install 2x MGN12C on the left side, 1x MGN12H on the right side
Use M3x12 bolt,washer,spring washer to secure the Y carrier to the MGN12H block. Make sure it nice and tight.
Use M1x15 countershunk bolt, 4x10 springx m3 washer to secure the Y carrier to the MGN12C block. DO NOT tighten the bolts too much, leave it some space to align the block itself.
I'm too lazy to write the full tutorial, check the pictures for more details.