nanoDLP

0x6c23

Member

Registered: 2018-05-12

Posts: 12

Weird conical stair-steps on print edges

I am facing a new problem here and I cannot seem to find the  culprit. I checked my settings aswell as my z-axis, which seems firm and sturdy.

Problem is the following: The edges of my printed objects are steppy, in a conical way:

Here are my resin profile settings:

https://imgur.com/a/GxESl7C

What could be the issue here? Thanks for helping!

0x6c23

Member

Registered: 2018-05-12

Posts: 12

Re: Weird conical stair-steps on print edges

I am almost certain that this is a software issue. I completely rebuilt my z-axis to make sure it is not the fault, I have literally zero play in it. Still, the same issue persists.

Here is my debug info:

https://www24.zippyshare.com/v/Kf2eNqF0/file.html

Shahin

Administrator

Registered: 2016-02-17

Posts: 3,541

Re: Weird conical stair-steps on print edges

It could be caused by wrong cure time, specially over-curing and also incompatible layer height with resin you are using.

0x6c23

Member

Registered: 2018-05-12

Posts: 12

Re: Weird conical stair-steps on print edges

Thanks for the answer! I dont think cure time is a problem here, also, layer height shouldn't be the culprit either. I did some tests:

https://imgur.com/a/dvNJQKo

As you can see on the image, I printed the same cube in 40, 50, 65, 65 µm layer height with 3.5, 4, 12 and 18 seconds exposure time.

Still, there are those ridges on every print. I also other combinations of layer heights and cure times, without success.

Shahin

Administrator

Registered: 2016-02-17

Posts: 3,541

Re: Weird conical stair-steps on print edges

Looks like you are using direct control, if you hear strange sounds from the stepper motor, decrease speeds as it indicate missing pulses. See if it any helps, also try increase lifts after layer print.