Ender 3 V3 Se : Y Axis Linear Rail Upgrade

Hi All,

I will share how to upgrade the Y-axis linear rail using a kit from Aliexpress....

While we often expect upgrade kits to include everything needed, many kits on AliExpress fall short—missing crucial parts and often suffering from compatibility issues. In this article, I’ll walk you through how to upgrade effectively and tackle three common problems in these kits.

1. Ender 3 ve Se y-axis linear rail kit (Link)
2. 2mm spacers x 8
3. Two M4x22 mm bolts with low head profile (had to sand it)
4. Double side tape
5. Match sticks
6. Grease or machine oil
7. Sandpaper
8. Sort the screws by Size

1. Remove the Bedplate
2. Unscrew 4 screws on the magnetic bed
3. Remove the bed and place it behind the printer, so that no wire gets pulled
4. Remove all bolts that are holding the bed on the rails.
5. Leave the Y belt in place.
6. We will use the M4 (10 nos) bolts later to mount

1. The Y-rails have 4 screws, which need to be removed to release the original y rails
2. Remove 4 screws from the Y motor and the 4 screws for the back side (this holds the power supply)
3. Clean the everything
4. We will use these screws/bolts later, keep them safely

1. Using M4X22 mount the back plate as shown
2. Using M4X14 screws mount the front plate as shown
3. Fix the new Y linear rails...
4. Till this step, we have all screws supplied by the Kit, further, we need to reuse all the screws we got after disassembly
5. Note that the screw head (m4x22) on the left side, will obstruct the path for the linear rail head. This is our first issue. #problem1
6. To Solve this, we need a low-profile head for M4X22,
7. I use some spare M4x30 nuts
8. Cut them to size using a saw
9. and then sanded the head to be 5mm in diameter
10. I replaced the last screw, but could not do the same for the front one.
11. I will order a new screw online.

1. Mount the Bed on the Y rails using the original screws
2. We have an issue with the Y belt, it touches the back plate and does not move freely #problem2
3. To Fix this, we need 2mm spacers to give a sufficient gap
4. Installing with spacers is tricky, I used match sticks to hold the spacers in place
5. And placed the bed on them, then one by one I removed a match stick and replace it with a screw

1. After installing the bedplate, I noticed that the y-limit switch was not getting triggered and the mount blocks were in the way #problem3
2. To fix this, we can add 2 nuts on the M4 screw on the bed, that triggers this switch.
3. Or we can sand the edge of the left block or create and print new mounts
4. Another problem is that the sensor circuit cannot be mounted, as the screws do not match. we can overengineer and design a part for this.... but I just used double side tape and stuck the circuit on plate #problem4

1. Once the plate is installed, mount the heating bed and the bed
2. I have used a silicone spacer, so we can tighten the screws to get perfect leveling
3. I have shared the initial screen and final screen after a few iterations.... \
4. Try high-speed printing and see how this performs....

Please share your experience and issues faced...

Curious how I got 7x7 bed leveling. I will create another article on it... stay tunned.