¶ Compatibility
This article applies to the following model and module. Please take note when referencing:
Model: U1
¶ Issue Description
¶ Toolhead Picking Failure
¶ Toolhead Parking Failure
¶ Solution
¶ Preparation
Quick Start Guide page 50-51 belt tension must be adjusted before calibrating the pick/park coordinates; otherwise, the new coordinates will still be invalid.
(1) Make sure all toolheads are placed back on the bracket and the red marks on all toolhead latches are not visible. If you cannot detach the toolhead through the screen, follow U1 How to Manually Detach the Toolhead.
(2) If you encounter issues during initialization, long press the top-left corner of the screen to skip and enter the home page.
(3) Enable Advanced Mode in Settings → Maintenance.
(4) Prepare a computer, tablet, or phone and connect it to the same Wi-Fi as U1.
(5) Open a browser, enter U1’s IP address (found in Settings → Wi-Fi), and access the Fluidd interface.
Read the important note and procedure below carefully before proceeding.
¶ Important Note
(1) Pick/Park coordinates refer to the (X, Y) positions the toolhead swapper moves to during pick or park operations. The actual coordinate system is shown in the diagram.
(2) Click Configuration → persistent folder → extruder_config.json → Edit to view the pick/park coordinates for the 4 toolheads.
| Code | Toolhead | Pick/Park coordinates (X,Y) |
|---|---|---|
 |
Toolhead1 | （ 30.5 , 332.6 ） |
 |
Toolhead2 | （ 102.7 , 332.6 ） |
 |
Toolhead3 | （ 170.2 , 332.6 ） |
 |
Toolhead4 | （ 237.7 , 332.6 ） |
(3) If pick/park coordinates are correct, when the toolhead swapper moves to the pick/park coordinates, the pick pin on its back should align with the hole on the left side of the toolhead. The following steps will guide you to adjust the coordinates. Do not attempt this on your own beforehand.
¶ Procedure
(1) If pick/park fails and there is no hardware issue, the X value in the pick/park coordinates (X, Y) may be incorrect. Refer to Important Note—(2) to check the coordinates for the toolhead. For illustration, define the coordinate as (X!, Y!). For toolhead 1: (X!, Y!) → (30.5, 332.6).
(2) Go back to the Home page and click Home XY in the Tool window. After homing is complete, you can control the toolhead swapper.
(3) Enter 250 in the Y coordinate field and press Enter to move the toolhead swapper to the default Y position.
(4) Enter X! in the X coordinate field and press Enter to move the toolhead swapper to the pick/park X position.
(5) Select the appropriate step and direction to move the toolhead swapper left or right, aligning the pick pin on its back with the hole on the left side of the toolhead.
To confirm alignment, select the appropriate step and direction to move the toolhead swapper along the Y axis toward the toolhead. The pick pin should fit into the left-side hole of the toolhead without any interference.
(6) Record the current X coordinate, copy and paste it into the corresponding position in Configuration → persistent folder → extruder_config.json, click SAVE, and then click CLOSE to exit.
(7) On the System page, click FIRMWARE RESTART. After the firmware restarts, go back to the Home page and send the pick/park command in the Console to verify if the updated coordinates work.
| Command | Function |
|---|---|
| T0 | Pick toolhead1 |
| T1 | Pick toolhead2 |
| T2 | Pick toolhead3 |
| T3 | Pick toolhead4 |
| PARK_EXTRUDER | Park current toolhead |
¶ Reach out to Snapmaker Support
After following the troubleshooting steps, if you find it difficult to resolve your issue, kindly submit a support ticket through https://snapmaker.formcrafts.com/u1-troubleshooting-request and share your troubleshooting results with some pictures/videos.
Our dedicated support team will be more than willing to assist you in resolving the issue.