# "Bump" in Y-axis **URL:** https://forum.snapmaker.com/t/bump-in-y-axis/10017 **Category:** Snapmaker 2.0 (3-in-1) **Created:** [October 2, 2020, 12:16pm UTC](https://forum.snapmaker.com/t/bump-in-y-axis/10017 "2020-10-02T12:16:27Z") **Posts on this page:** 1 **Showing post:** 46
### Author: ![Snapmik](https://avatars.discourse-cdn.com/v4/letter/s/6bbea6/32.png) [@Snapmik](https://forum.snapmaker.com/u/Snapmik) #### Post date: [October 27, 2020, 12:55pm UTC](https://forum.snapmaker.com/t/bump-in-y-axis/10017/46 "2020-10-27T12:55:27Z")
Hi Edwin, thanks for your answer. The experiment you suggest has already done and published here in answer 38 of this same topic. Some of us conclude that the problem was caused by the speed difference between the Y axes. After changing one of the linear modules with the X-axis one, the problem has been solved. You could also have a look to this other topic for further reference: > [@Lineal modules: Non-uniform working speed](https://forum.snapmaker.com/t/lineal-modules-non-uniform-working-speed/10715): > > Hi all, I think that some of the several problems being reported in this and other forums are caused by the same issue: the non-uniform lineal modules working speeds. I will try to summarise in one post my experience and how I have “solved” (or better said, hacked) the problem. First of all a bit of background: I ordered my SM 350A in July 2019 (as part of the pre-sales batch) and received it in mid September 2020. I am using Luban 3.9 with the firmware version 1.9.0 . Since the beginning I h… Regards --- _[View the full topic](https://forum.snapmaker.com/t/bump-in-y-axis/10017)._