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SLIC3R : support /contact Z distance  

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Jeremy
(@jeremy)
Eminent Member
SLIC3R : support /contact Z distance

Hi,

I use slic3r Prusa edition 1.37.2. When i generate support, and choose 0,2mm (detachable) for contact z distance, it seems the distance is a way more. Any body have noticed it ? Even if i reduce to 0,1mm, it seems been more, and the "1st" layer printed on the interface support layer is not squished at all, and ugly...

Any advice welcome,

happy print ! 🙂

Posted : 09/02/2018 8:31 am
Carsten
(@carsten-2)
Estimable Member
Re: SLIC3R : support /contact Z distance

I can't help just that I never got a half decent layer first after a support in slic3r. And always had the impression that this was due to the gap there...

Carsten

My Prints: https://www.prusaprinters.org/social/15695-carsten/prints
My Employer: https://make-magazin.de

Posted : 01/03/2018 3:48 pm
Carsten
(@carsten-2)
Estimable Member
Re: SLIC3R : support /contact Z distance

Well I just digged a bit into the problem.

The original logic behind is that you can't have a smaller contact Z Distance than your layer heigth is. However in former Slic3r versions the minimal distance was also based on the nozzle size PLUS the contact distance. Even more confusing a value below 0.1 was the same as 0.0mm so no interface layers and only for soluble support.

I think with the variable layer height of slic3r PE the could be a solution, however at the moment it does not seem to work. Try to make small layer heigths just at the support border and still the support layers are in your base layer height.

How it could look: https://docs.google.com/presentation/d/1j9IupPthcPUwxF2mBdEuGB4oQgTDVU5HaXW9igvktAA/edit#slide=id.g2bd9ae017d_0_64

Part of the problems seems that the first exprusion after the gap will be calculated as round "in thin air" printed filament, so that also need to be tackled. We obviously want a inbeetween where the first object layer over support sticks a bit to the support and can rest there so that the layer is tight.

I also see no problem in printing the last interface layer with a smaller layer height as long as you print the support first, then advance Z to the object layer Z height and go on. (I may be wrong)

Carsten

My Prints: https://www.prusaprinters.org/social/15695-carsten/prints
My Employer: https://make-magazin.de

Posted : 05/03/2018 7:27 pm
Jeremy
(@jeremy)
Eminent Member
Topic starter answered:
Re: SLIC3R : support /contact Z distance

Hi,

First it seems i have not been in total errors by myself.

To illustrate :

Settings : general layer height : 0.1 / raft with 4 layers / 1 interface / with detachable 0.2

1st layer : 0.1
2nd : 0.4
3rd : 0.7
4th : 1.00 (interface)
5th : 1.60 !!!!! (1st layer)

even with a 0.1 layer height ....

If i don't miss anything, Slic3r is just far away from something which could work ?

FYI : When i print with ABS, (or ASA) i choose "soluble, 0.0" and i use multi-material to make the raft with HIPS. If you do a last full interface layer, it will detach easily and you will get an acceptable looking on the bottom of your first layer (without any use of D-limonene).

Having choose to instal MMU on the MK2 = slice with a limited Slic3r PE MMU version. I'm glad i have others printers, and would not recommend to have MMU if only own 1 printer. So frustrating.

Posted : 10/03/2018 8:02 am
lubo.d2
(@lubo-d2)
Active Member
Re: SLIC3R : support /contact Z distance

I also see this problem. Slic3r needs to stop adding the nozzle width to the Contact Z Distance.

I recognize that the slicer must respect the layer height (unless variable height is used), but currently, we can only choose between:

1) having NO GAP at all between the supports and the object
2) having 1 layer height + nozzle diameterr between the supports and the object, so with 0.2mm layers + 0.4mm nozzle this equals to a 0.6mm gap --> printing in thin air that screws up everything.

Posted : 07/06/2018 11:31 pm
أسامة الحازمي
(@-17)
New Member
Re: SLIC3R : support /contact Z distance

For the current version it seems to subtract the layer height from the nozzle size and adds it to the z contact distance

Posted : 21/07/2018 8:21 pm
DaddyBoomalati
(@daddyboomalati)
Eminent Member
Re: SLIC3R : support /contact Z distance

Evidently there has been no headway on this matter. I recently just purchased a Mk3 and prints requiring supports over a large horizontal area are failing (curling). I set the contact Z distance = 0.1 and the interface layers to 1 or 0, and there is still a 0.5 distance between the part and support!

I saw a thread over at GitHub and the developer was just plain rude to the person reporting it. I have since switched back to S3D, which is fine, but doesn't place the supports in the XY as nicely as Slic3r. I can't win. I am trying a part in S3D with custom-built supports on the section that is failing.

Edit-funny enough, Cura is doing a good job, so I'm full circle and back there.

Thanks,
Dave Smith

Posted : 03/09/2018 6:39 pm
BadPractice
(@badpractice)
Active Member
Re: SLIC3R : support /contact Z distance

Same bug here. Is there a official ticket to this?

Posted : 12/09/2018 1:25 am
Vojtěch Bubník
(@vojtech-bubnik)
Member Admin
Re: SLIC3R : support /contact Z distance

You may test the support improvements in the Slic3r 1.41.1-beta .

https://github.com/prusa3d/Slic3r/releases/tag/version_1.41.1-beta

Posted : 26/09/2018 5:58 pm
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