# Gsender configuration for 1.5 kw spindle and SLB-EXT

**URL:** <https://forum.sienci.com/t/gsender-configuration-for-1-5-kw-spindle-and-slb-ext/25633>\
**Category:** ❓Question\
**Created:** [February 6, 2026, 10:56pm UTC](https://forum.sienci.com/t/gsender-configuration-for-1-5-kw-spindle-and-slb-ext/25633 "2026-02-06T22:56:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rtr](https://forum.sienci.com/letter_avatar_proxy/v4/letter/r/34f0e0/32.png) [@rtr](https://forum.sienci.com/u/rtr)\
**Post date:** [February 6, 2026, 10:56pm UTC](https://forum.sienci.com/t/gsender-configuration-for-1-5-kw-spindle-and-slb-ext/25633/1 "2026-02-06T22:56:02Z")

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I just received my 1.5 Kw spindle and setting it up. All the documentation I can find only mentions the SLB. The gcode file in Sience’s documentation specifically says ‘for the SLB, not for the SLB-EXT controller’. I have the SLB-EXT controller and need the gsender configuration for the SLB-EXT controller. I tried using the file they included even though it says it’s not for the SLB-EXT, now the spindle only stays on for about 10 seconds and then turns off. I’m going to restore my gsender configuration I saved before I ran their file but am at a loss at what changes to make in gsender. I emailed Sienci but have not received a reply. I’m hoping someone I this forum has the 1.5 Kw spindle and the SLB-EXT controller and can tell e the changes I need to make in gsender.

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**Author:** ![Chucky\_ott](https://forum.sienci.com/user_avatar/forum.sienci.com/chucky_ott/32/8692_2.png) [@Chucky\_ott](https://forum.sienci.com/u/Chucky_ott)\
**Post date:** [February 6, 2026, 11:24pm UTC](https://forum.sienci.com/t/gsender-configuration-for-1-5-kw-spindle-and-slb-ext/25633/2 "2026-02-06T23:24:45Z")

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@rtr Did you see this document: [10. Spindle Kit Setup - AltMill CNC](https://resources.sienci.com/view/am-mk2-spindle-kit-setup/)

There’s a download link to a g-code file for the SLB-EXT