This mod replaces the X-axis v slot wheels with an MGN9 linear rail.
If you don't know if you need linear rails on the X-axis then you probably won't benefit from this. But if you want linear rails like I did, then enjoy.
- Dimensional accuracy and flow calibration is required in order for the nut trap to fit the nuts securely.
- BOM.
- Either an MGN9C or MGN9H carriage can be used. Ideally use rails with some preload to improve wobble along the Y axis.
- Use Voron print settings.
- Probably avoid PLA due to the nut trap only being two walls thick.
- No additional supports required.
- Print STLs in their default orientation.
After installation remember to re-calibrate the Z-offset and recreate the bed mesh.
Measurements and spacers inspired by https://www.printables.com/model/716958-linear-x-rail-mod-ender-3-v3-se. This version doesn't sacrifice X-axis movement and doesn't need a new endstop. The nozzle sits a bit forward in the Y axis.
See results.md for input shaper results.
Ender 3 V3 SE reference model taken from https://www.printables.com/model/672045-ender-3-v3-se-reference-models-step-files.
Prerequisites:
PYTHONPATH is required to generate the BOM with costs:
PYTHONPATH=$PWD ~/.local/share/OpenSCAD/libraries/NopSCADlib/scripts/make_all.py
| Carriage | Linear Rail | Carriage Rail | Toolhead Carriage | TOTALS | |
|---|---|---|---|---|---|
| Vitamins | |||||
| . | 7 | . | . | 7 | Linear rail MGN9 x 300mm |
| . | 1 | . | . | 1 | Linear rail carriage MGN9C |
| . | 7 | . | . | 7 | Nut M3 hammer |
| 2 | . | . | . | 2 | Nut M5 x 4mm |
| . | . | 4 | . | 4 | Screw M3 cap x 8mm |
| . | 7 | . | . | 7 | Screw M3 cap x 10mm |
| . | . | . | 2 | 2 | Screw M5 wafer head x 4mm |
| . | . | 4 | . | 4 | Washer M3 x 7mm x 0.5mm |
| 2 | 22 | 8 | 2 | 34 | Total vitamins count |
| 3D printed parts | |||||
| . | 1 | . | . | 1 | left_spacer.stl |
| . | 1 | . | . | 1 | middle_spacer.stl |
| . | 1 | . | . | 1 | right_spacer.stl |
| 1 | . | . | . | 1 | toolhead_carriage_MGN9C.stl |
| 1 | . | . | . | 1 | toolhead_carriage_MGN9H.stl |
| 2 | 3 | . | . | 5 | Total 3D printed parts count |
| Qty | Description |
|---|---|
| 2 | Nut M5 x 4mm |
| 1 x toolhead_carriage_MGN9C.stl | 1 x toolhead_carriage_MGN9H.stl |
|---|---|
 |
 |
First remove the two supports at the top of the model.
The nuts should be a tight fit. If you have trouble pushing the nut in, check if there is any substantial corner blobbing due to lack of pressure advance and/or insert an M5 screw from the otherside and tighten.
| Qty | Description |
|---|---|
| 7 | Linear rail MGN9 x 300mm |
| 1 | Linear rail carriage MGN9C |
| 7 | Nut M3 hammer |
| 7 | Screw M3 cap x 10mm |
| 1 x left_spacer.stl | 1 x middle_spacer.stl | 1 x right_spacer.stl |
|---|---|---|
 |
 |
 |
Attach the spacers to the assembly, taking note that the left spacer is offset by one screw hole.
Remember to clean and lubricate both the carriage and rail.
| Qty | Description |
|---|---|
| 4 | Screw M3 cap x 8mm |
| 4 | Washer M3 x 7mm x 0.5mm |
| 1 x carriage_assembly | 1 x linear_rail_assembly |
|---|---|
|
|
Attach the carriage to the rail. Note that the front two screws won't be easily accessible once the PCB is mounted.
| Qty | Description |
|---|---|
| 2 | Screw M5 wafer head x 4mm |
| 1 x carriage_rail_assembly |
|---|
|
Screw the frame into the carriage, ensuring that the frame is flush on the carriage. Remember to insert the belts before re-assembling the everything else.
