Add "First layer fan speed" option #1928

New Issue

MrUnknownDE · 2026-04-05T21:21:35+02:00

MrUnknownDE commented

2026-04-05 21:21:35 +02:00

Originally created by @MxBrnr on 10/12/2025

Is there an existing issue for this feature request?

I have searched the existing issues

For many printers with toolheads made from 3D printed parts, a high bed temp can cause deformation of the toolhead components during the first layer due to close proximity and no cooling airflow.

Which printers will be beneficial to this feature?

All

Describe the solution you'd like

Add a new setting to allow an "initial layer fan speed" to be defined.
This will allow the user to set a part cooling fan speed - independent of the normal fan speeds, which may be excessive for the first layer- that can provide cooling airflow to the toolhead to prevent distortion of toolhead components.

Describe alternatives you've considered

Performing this action via a macro is possible, but appears to require coding specific to each firmware type, meaning users with multiple types of machines will have to create multiple custom macros applicable only to each respective machine.

Additional context

A toolhead made of ABS/ASA (e.g. common Voron toolheads) can have a glass transition temp below that of which the heated bed may be operating (e.g. 85C vs 110C). During prints which may spend a considerable amount of time on the first layer, this can leave the toolhead in very close proximity to the heated bed, where the heat and time spent in it may cause the toolhead to deform.

*Originally created by @MxBrnr on 10/12/2025* ### Is there an existing issue for this feature request? - [x] I have searched the existing issues ### Is your feature request related to a problem? For many printers with toolheads made from 3D printed parts, a high bed temp can cause deformation of the toolhead components during the first layer due to close proximity and no cooling airflow. ### Which printers will be beneficial to this feature? All ### Describe the solution you'd like Add a new setting to allow an "initial layer fan speed" to be defined. This will allow the user to set a part cooling fan speed - independent of the normal fan speeds, which may be excessive for the first layer- that can provide cooling airflow to the toolhead to prevent distortion of toolhead components. ### Describe alternatives you've considered Performing this action via a macro is possible, but appears to require coding specific to each firmware type, meaning users with multiple types of machines will have to create multiple custom macros applicable only to each respective machine. ### Additional context A toolhead made of ABS/ASA (e.g. common Voron toolheads) can have a glass transition temp below that of which the heated bed may be operating (e.g. 85C vs 110C). During prints which may spend a considerable amount of time on the first layer, this can leave the toolhead in very close proximity to the heated bed, where the heat and time spent in it may cause the toolhead to deform.

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Due Date

No due date set.

Dependencies

No dependencies set.

Reference: github/OrcaSlicer#1928