[BUG] Wait time before cure does not appear to create empty base layer

[Vexs]

System

• OS: Win10 x64
• Slicer: Lychee
• Printer: Elegoo saturn
• UVtools version: 3.4.2

UVtools v3.4.2 X64
Operative system: Microsoft Windows 10.0.19044 X64
Processor: AMD Ryzen 7 2700X Eight-Core Processor         
Processor cores: 16
Memory RAM: 14.09 / 15.93 GB
Runtime: win10-x64
Framework: .NET 6.0.5
AvaloniaUI: 0.10.14
OpenCV: 4.5.5-237

Sreens, resolution, working area, usable area:
1: 2560 x 1440 @ 100% (Primary) (On this)
    WA: 2560 x 1410    UA: 2560 x 1410

Path:       C:\Program Files\UVtools\
Executable: C:\Program Files\UVtools\UVtools.exe

Describe the bug

Applying the "wait time before cure" suggestion does not appear to create the empty base layer required for this to work- both in-editor and on-printer. I also believe it's skipping the rest time adjustment as well as it appears to instantly start exposing on-printer.

This bug does not appear with the script that predates this being integrated into uvtools

To Reproduce

Steps to reproduce the behavior: Apply wait time before cure Observe that no empty layer is created in-editor

Expected behavior

An empty layer is created

Screenshots

Bottom layer, wait time before cure applied

[sn4k3]

Empty layer is only created if possible. You may be runing the CTBv2 which is unable to use that. Check your CTB version or upload the file here so i can check

I know for sure you aren't on V4 and V3 is compatible, so you should be on V2. I recommend you upgrade your saturn firmware and start using v4 to benefit from proper wait times

[Vexs]

Hm, I'd expect that the existing script wouldn't work then- but it does. That said- you were correct, it appears lychee is outputting V2 ctb files however! Changing to V4 does produce the desired results, but I don't get why that script would work then unless it's just ignoring the file version and throwing stuff in that could possibly not work....

It might be nice if there was a warning about this in wait time before ready or similar.

I'm testing this now, will close if it's fixed.

[sn4k3]

Hm, I'd expect that the existing script wouldn't work then- but it does.

Script is outdated and UVtools suggestion is way safer. It's working, but the deal is: CTBv2 don't support custom layer position, meaning layer 0 (empty) will print at your layer height, lets say 0.05mm, but layer 1 (the real first layer) will print at 0.10mm instead of 0.05mm because CTBv2 don't support overrides nor care about our set position, potential leading to failure if is too tall to adhese to plate. Due to that potential failure point, i don't allow it on those cases. Also, empty layer is only required on CTBv4 as fair i know. CTBv3 dont require it because they only mess up firmware first layer wait times on v4, although i have no feedback how it works for v2, in anycase v2 should not be used anymore, neither v3. V4 is what all people should go because of introduced proper wait times (No light off delay BS)

[Vexs]

Yep, changing to CTB4 format resolved the issue! Closing, but a note or warning if the version is <3 would be a nice add I think.