# Need help with 4-color printing u1

**URL:** <https://forum.snapmaker.com/t/need-help-with-4-color-printing-u1/41106>\
**Category:** U1 Toolchanger\
**Created:** [January 27, 2026, 10:34pm UTC](https://forum.snapmaker.com/t/need-help-with-4-color-printing-u1/41106 "2026-01-27T22:34:53Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![kraut55](https://avatars.discourse-cdn.com/v4/letter/k/dfb087/32.png) [@kraut55](https://forum.snapmaker.com/u/kraut55)\
**Post date:** [January 27, 2026, 10:34pm UTC](https://forum.snapmaker.com/t/need-help-with-4-color-printing-u1/41106/1 "2026-01-27T22:34:54Z")

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Hi,

I am new to multicolor printing and need help trying to print a CYMK Lithophane.

I used a program to create the necessary stl-files (Itslitho). Each file creates a layer in 1 color

- As described I imported the files together into the Snapmaker Orca as a Single Object
- The colors in the slicer correspond with the toolheads of the U1.
- I made sure the Prime Tower was enabled
- I picked “slice all”

After I sliced there was no tower. I printed a few layers but it was all just in white.

What am I not doing or doing wrong to get a tower and a correct multicolor print?

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**Author:** ![Simon\_Zhi](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.snapmaker.com/simon_zhi/32/30470_2.png) [@Simon\_Zhi](https://forum.snapmaker.com/u/Simon_Zhi)\
**Post date:** [January 28, 2026, 3:27am UTC](https://forum.snapmaker.com/t/need-help-with-4-color-printing-u1/41106/2 "2026-01-28T03:27:49Z")

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Anything U1-related can be posted in this section.

 ![image](https://us1.discourse-cdn.com/flex022/uploads/snapmaker/original/3X/c/9/c9daf90db699a73d5b1ed40747bff359dda4a15a.png)

When asking for help with a specific issue, please share plenty of images or files for reference—screenshots of your slicer settings, preview shots, or even the 3MF itself—so forum members can slice it and compare results.

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**Author:** ![kraut55](https://avatars.discourse-cdn.com/v4/letter/k/dfb087/32.png) [@kraut55](https://forum.snapmaker.com/u/kraut55)\
**Post date:** [January 29, 2026, 6:31pm UTC](https://forum.snapmaker.com/t/need-help-with-4-color-printing-u1/41106/3 "2026-01-29T18:31:50Z")

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Consider it solved

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**Author:** ![fatboy1271](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.snapmaker.com/fatboy1271/32/31087_2.png) [@fatboy1271](https://forum.snapmaker.com/u/fatboy1271)\
**Post date:** [January 29, 2026, 9:43pm UTC](https://forum.snapmaker.com/t/need-help-with-4-color-printing-u1/41106/4 "2026-01-29T21:43:47Z")

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I believe your issue is Single Object… you need multiple Objects in order to properly assign the Toolheads/colors.