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Layer speed above support


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Posted (edited) · Layer speed above support

Hello everyone!


I've been using Cura for years now, but I've come across a problem: As far as I can tell, there is no setting to tell Cura to print the first layer above support (or supported areas generally) slower than the usual layers. But let me start with a description of the relevant situation.


I am printing the connector of a circular duct, and at a certain height it has a lip all around (increasing concentric radius by about 1cm) to form a proper seal and create a stopping point. This lip is basically a 90° overhang and thus support is needed. Since I am using a well calibrated printer, I am usually able to print at high speed (130mm/s+). However, since the wall of the first supported layer is only resting on the support interface, this is too high of a speed to properly lay down this layer, resulting in an aborted first attempt.




I tried finding a setting to slow down said first layer above the support, but there really seems to be none. Sure, Top/Bottom Speed can be set to an acceptable value, this does however not seem to affect the wall of this bottom layer, which is the actual issue. I could set wall setting lower, but that would slow the entire print down to unacceptable levels. I tried the post-processing > Modify G-Code ChangeAtZ 5.1.1 (Experimental) for the first two layers above support. I was careful to set the Behavior to single layer on both of those scripts, slowing print speed first to 25, then 40% on the respective scripts. While I told it to only do it on these layers, the experimental nature seems to have bitten me in the behind since it kept those values and apparently multiplied them with each other. Consequently, what was scheduled as a 2 hour print is already closing in on 4 hours, printing merrily at around 10mm/s, and it is far from done.





Did I miss a relevant setting? Has noone else ever had this problem? I was searching this forum, reddit, GitHub etc. to no avail



TL;DR: There's no way to slow down printing (walls) above support, ChangeAtZ is bugged, did I miss something?


Since attachments have higher quality, you can actually read what it say here:


Supported Wall Speed.jpg

Failed Print.JPG

Edited by thefoxburrow
Attachments have higher quality
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    Posted · Layer speed above support
    On 7/15/2020 at 4:24 PM, burtoogle said:

    Hi, a possible solution would be to install my Cura that has an extra option to enable bridging over support.


    You can find my builds at https://www.dropbox.com/sh/s43vqzmi4d2bqe2/AAADdYdSu9iwcKa0Knqgurm4a?dl=0


    Please read the README.md before using.


    Thanks, I'll have a look at it on the weekend

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