# Mini 1.0 missing Z steps **URL:** \ **Category:** LulzBot Mini\ **Created:** [December 13, 2022, 5:07pm UTC](https://forum.lulzbot.com/t/mini-1-0-missing-z-steps/25140 "2022-12-13T17:07:22Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Echo](https://avatars.discourse-cdn.com/v4/letter/e/c6cbf5/32.png) [@Echo](https://forum.lulzbot.com/u/Echo)\ **Post date:** [December 13, 2022, 5:07pm UTC](https://forum.lulzbot.com/t/mini-1-0-missing-z-steps/25140/1 "2022-12-13T17:07:22Z")
I’ve been working on reviving a Lulzbot mini 1.0 that was donated to our makerspace back in 2015. It had a long list of things wrong with it and I finally got it printing again. For the most part, everything seems to be working okay. However, I’ve noticed that the printer occassionally misses some z steps. When moving z axis, it occassionally misses some steps, resulting in non-smooth motion. I suspect this is why some of the layers whilst printing end up getting squishes together. [Here’s a video of what I mean](https://youtube.com/shorts/-BPP-jbwRgk?feature=share) Any tips on how to resolve this? ---
**Author:** ![Echo](https://avatars.discourse-cdn.com/v4/letter/e/c6cbf5/32.png) [@Echo](https://forum.lulzbot.com/u/Echo)\ **Post date:** [December 20, 2022, 3:20pm UTC](https://forum.lulzbot.com/t/mini-1-0-missing-z-steps/25140/2 "2022-12-20T15:20:50Z")
Just in case it’s useful for anyone - I believe the issue was stepper driver overheating. The drivers had no heatsinks on them. After adding heatsinks, I’ve done over 100 hours of printing now with no issues ---
**Author:** ![McLeach](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/mcleach/32/11215_2.png) [@McLeach](https://forum.lulzbot.com/u/McLeach)\ **Post date:** [December 20, 2022, 6:37pm UTC](https://forum.lulzbot.com/t/mini-1-0-missing-z-steps/25140/3 "2022-12-20T18:37:04Z")
Hello, Take caution as you could damage your 3D printer if your heat sink falls off. Our internal testing has determined that the heat sink provides no added benefits. Your 3D printer will operate normally without this installed. If you are having issues with the stepper drivers overheating, I would check that your case fan is functioning.