Ender 3 Cr20 Pro Y Axis Linear Rail Kit Install Repair Guide

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Ender 3 / CR20/PRO Y axis Linear rail kit install
12 steps

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Step 1

              Teardown

Remove all 4 bed leveling screws for the Bed heater.
Lift the bed heater and set it behind or to the left of the printer

Remove all 4 bed leveling screws for the Bed heater.

Lift the bed heater and set it behind or to the left of the printer

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Step 2

              Teardown

Remove all 4 idler pulley bracket screws
Lift pulley bracket to remove tension on the belt
Remove Y belt
Remove idler pulley bracket and set aside all parts

Remove all 4 idler pulley bracket screws

Lift pulley bracket to remove tension on the belt

Remove Y belt

Remove idler pulley bracket and set aside all parts

Step 3

              Y Carriage

Slide off Y carriage of the front of the Y axis extrusion
Remove V-Slots wheels

Slide off Y carriage of the front of the Y axis extrusion

Remove V-Slots wheels

Step 4

              Rail Prep

Remove Linear Rails for packaging and Wipe off excess oil with a lint free cloth
Preinstall M3x8 SHCS and Sliding Tnuts
Take Note to skip 2 holes between each fastener, and ensure to mirror this process from each end of the rail until you overlap in the middle

Remove Linear Rails for packaging and Wipe off excess oil with a lint free cloth

Preinstall M3x8 SHCS and Sliding Tnuts

Take Note to skip 2 holes between each fastener, and ensure to mirror this process from each end of the rail until you overlap in the middle

Step 5

              Slide On & Mount Rails

Note Sliding in the Linear rails do not allow rail block to slide off the end of the rails.
Insert Printed T-nut guide to help with sliding the rail into the top slot on the Y axis extrusion
Slide the rails into the top T-slot
Aline rails with the end of the extrusion using one of the included stiffener plates as a stop

Note Sliding in the Linear rails do not allow rail block to slide off the end of the rails.

Insert Printed T-nut guide to help with sliding the rail into the top slot on the Y axis extrusion

Slide the rails into the top T-slot

Aline rails with the end of the extrusion using one of the included stiffener plates as a stop

Step 6

              Mount Rails

Note when sliding on Rail alignment Jigs do not allow Linear rail block to slide off the end of the rails.
Tighten the M3 mounting bolts to the front of the rail to the back on both sides

Note when sliding on Rail alignment Jigs do not allow Linear rail block to slide off the end of the rails.

Tighten the M3 mounting bolts to the front of the rail to the back on both sides

Step 7

              Ender 3 / CR20-PRO 5th Hole

Linear rail Block mounting hardware Per rail block mounting hole
M3x12 SHCS
2x M3 Flat Washer Per hole
Split lock washer
Stiffener plate 5th hole Screw
M3 Hex nut

Linear rail Block mounting hardware Per rail block mounting hole

M3x12 SHCS

2x M3 Flat Washer Per hole

Split lock washer

Stiffener plate 5th hole Screw

M3 Hex nut

Step 8

              Mounting Rail Carriage Adaptors

Right side
Left side

Right side

Left side

Step 9

              Y Carriage Install

M4x10 FHCS
M4x12 BHCS
M4 washer
M4 washer large OD
M4 FHCS screw first. Then attach the M4x14S BHCS screw with the washer Stack.
Slide the Y Carriage forward and check that Y Carriage is parallel to that front of the Y extrusion. Then tight the screws fully.

M4x10 FHCS

M4x12 BHCS

M4 washer

M4 washer large OD

M4 FHCS screw first. Then attach the M4x14S BHCS screw with the washer Stack.

Slide the Y Carriage forward and check that Y Carriage is parallel to that front of the Y extrusion. Then tight the screws fully.

Step 10

              Y Endstop Spacer

Install this spacer between the Endstop bracket extrusion
Check that the y endstop is triggered by the Adaptor plate

Install this spacer between the Endstop bracket extrusion

Check that the y endstop is triggered by the Adaptor plate

Step 11

              Belt Re-install

Re-install idler pulley bracket
Re-install Belt back into the tab slots
Pulley idler pulley bracket forward to tighten the belt.
Then tighten mounting screws on both sides

Re-install idler pulley bracket

Re-install Belt back into the tab slots

Pulley idler pulley bracket forward to tighten the belt.

Then tighten mounting screws on both sides

Step 12

              Reinstall Bed Plate

CR20 Pro
Reinstall: bed heater plate, Solid bed mounts, Nylock nuts or bed leveling knobs
Ender 3 and CR20
Reinstall: bed heater plate, bed leveling springs and bed leveling knobs

CR20 Pro

Reinstall: bed heater plate, Solid bed mounts, Nylock nuts or bed leveling knobs

Ender 3 and CR20

Reinstall: bed heater plate, bed leveling springs and bed leveling knobs

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