Linear rail mod for Prusa mk3

• This mod use 300mm MGN12 linear rails. (I used the Chinese one, that only cost under $15 each)
• No need to cut the rail.
• The parts are design to match the original build height(Z) and Y movement spaces, so NO build volume lost and NO needed to modify the firmware. It will pass all the self-test 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( not needed in rev2)-> Demo video https://www.youtube.com/watch?v=MpT0MBIkZBg

  Change log

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2020/04/21 Updated rev2

• Adjust Square nut slot and blot hole size.
• More compact and stronger Tail and Bridge mounter.
• All part can be printed with out support.
• Can be use with both older sliver and newer black PSU without modify the PSU case. Why

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• The Chinese liner rail is cheap and it much stable and quieter than the smooth rod - bushing combo.
• The linear rail look neat.Q/A

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• Q : But the Y rod is 330mm, your rail is only 300mm..
• A : Look at the last picture.Parts list

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Bolts and washers

• 2x 300mm MGN12 rail
• 3x MGN12C block
• 2x M3x10 bolt
• 10x M3x12 bolt
• 4x M3x15 countershunk bolt
• 6x M3 washer
• 12x 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
• 8x M3x15 bolt
• 8x M3 square nut
• • spring washer are optional

  ### Printable part rev2

• 2x head mount

• 4x node mount
• 2x tail mount (need to be mirrored in slicer)Installation

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• Put m3 nut(nylocs are recommended) into the Tail printed parts.
• Mount the printed parts to the printer frame. Tail parts use M4 bolts.
• Install the Rails using M3x10 bolts. Don't over tighten the bolts, this will make the part to deform.
• Install 2x MGN12C on the left side, 1x MGN12C (MGN12H will also work) on the right side
• Use M3x10 bolt,washer,spring washer to secure the Y carrier to the left block. Make sure it nice and tight.
• Use M1x15 countershunk bolt, 4x10 springx m3 washer to secure the Y carrier to the right blocks. 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.

  Print Settings

Rafts:

No

Supports:

Resolution:

0.2mm

Infill:

Filament:
Any PETG or ABS Any

Category: 3D Printing Tests