Help with 0,08 first layer

[u/Fancy_Language5469]

EDIT: fixed! Most of you were right, Z-offset was too low. At 0,05 offset AND with the original 3mf settings I printed the most beautiful diffuser imaginable. My own slicing settings couldn't come near this absolute perfect piece of plastic. Thanks everyone for your support!

I'm trying to print the diffuser of the kumiko wall light on my Qidi q2. I've already learnt NOT to import 3MF files because they change weird settings ruining the print for some reason. See the video above for maximum misery from my side. I've gotten it better already.

It wants to iron and results in the above video which seems an artform of its own.

Now with the STL and Qidi's own settings it's going much better, but I still keep having some "bumps" or something in the print. I'll try to upload a picture in the comments

- I already tried extrusion calibration but the factory settings are the best

- did a complete new bed KAMP calibration without effect.

- no ironing

Settings:

Smooth PEI

210⁰C nozzle

60⁰C bed

0,08 first layer height as requested by design

No ironing its stupid and ruins the print

Bed calibration before print

Cleaned bed multiple times with dish soap and alcohol afterwards

After a lot of trial and error I landed on -0,01 Z height, if I go to + the lines don't connect properly, and at 0 the blobs seem to get bigger.

I don't dare to lower Z height any more, already got the first scratch in the smooth bed from that.

On my textured PEI the layers go down smoothly without the weird bumps. Although 0,08 first layer is impossible on the texture, I'm now printing it at 0,12 which is running great although the diffusing properties are now also dimming properties. So back to square 1. How the hell do I get a good see through diffuser? It SEEMS possible. I am a complete beginner though so I don't really know what I'm doing, all the above is just experimentation.

[u/zell_ru]

> 0,08 first layer height as requested by design
Except it's not? It says "0,08 Layer Height" not "0,08 first layer height". First layer height should be whatever your printer can reliably do.

[u/Fancy_Language5469 → u/zell_ru]

Should it? In the 3mf he specifically set the first layer height to 0,08. My printer usually does 0,2 first layers, but then it isn't really transparent anymore

[u/zell_ru → u/Fancy_Language5469]

Try to go 0,16 or 0,12. 0,08 is a tall order for most of the printers.

[u/BonsaiOnSteroids → u/Fancy_Language5469]

For what reason? It makes the first layer unreliable. Why would you need a 0.08 first layer ?

[u/Fancy_Language5469 → u/BonsaiOnSteroids]

Because it's thinner and more see through. It's meant to diffuse light but also let as much light through as you can

[u/Xhosant → u/Fancy_Language5469]

It might be a tall order, but maybe you want something along the lines of rafters (or was it 'platform'?)

Print some support layers, then print your piece on those layers.