Header image: xTool, official product material.
A white edge around a design can ruin a print that otherwise has good color. On the xTool O1 Omni, there are two tools worth knowing: white ink choke and the dual-head calibration for the rotary attachment. They address different issues, and the right one must be chosen.
White ink choke: retracting the outline of the white base
The white base provides coverage beneath the color. White ink choke reduces its spread at the edge: the white contour is brought slightly inward relative to the color printed on top. This reduces the chance of a white line peeking out around it.
It does not mean lowering the number of white layers or uniformly reducing its overall opacity. It is an adjustment of the mask contour. It can help with a slight visible edge; it does not, on its own, correct a significant offset between print heads.
The official Studio usage guide places white ink choke in the right-hand processing parameters panel. Select the design, locate the setting in the print options, and test a small retraction on the actual material. Increasing it excessively can leave edges with less coverage and impair fine text or small details.
Compare a sample without retraction and one with the adjustment, keeping all other parameters the same. Check small text, narrow lines, and boundaries on dark or transparent substrates in particular. We do not publish a universal value: the design and the substrate change the result.
In Dual UV there is a specific calibration for the rotary
When white and color are offset when printing a tumbler with OR1, the alignment of the two print heads should be checked. Studio offers a specific wizard called Rotary Attachment Dual-Head Calibration. Its purpose is to adjust the registration between layers in rotary printing and correct halos caused by that misalignment.
The official screenshot of the O1 Omni settings shows the path: device settings, Calibration tab, Rotary Attachment Dual-Head Calibration option, Start button. Follow the wizard and its requirements for the piece and pattern. We do not substitute the dimensions indicated by the installed version with approximate measurements.
The plugin 0.6.6 notes confirm changes to the final screen of that Dual UV wizard. An updated version helps follow instructions that are consistent with the equipment.
OR1 calibration and dual-head calibration are different
Studio also shows Rotary attachment calibration. The official rotary printing guide requires, for that geometric calibration, cleaning the four reference points, removing the piece, and closing the jaw to its minimum opening before starting the process. That step must not be confused with Dual-Head alignment, which has its own wizard.
After calibrating, mount and model the piece according to the guide. Run a test print with white and color and check the edge. If the halo persists, review the mounting, modeling, and registration with the substrate. A halo alone does not identify its cause.
Choosing the adjustment based on what the test shows
- White peeking out slightly along the contour: check white ink choke with a sample.
- White and color offset on the tumbler: check the rotary Dual-Head calibration.
- Incorrect position or modeling: check the mounting and geometric calibration of the OR1.
Our starting point of two layers of white and one of color is explained in the first impressions of our Dual UV. That initial recipe also does not replace alignment or the adhesion test on each material.
Check the OR1 product page on xTool [xTool EU]. These are affiliate links: we may receive a commission at no extra cost to you. How we fund this blog.
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