Feature Request: Support z-contact distance Optional with Detect Bridges

[AbeFM]

Version

2.0.0

Operating system type + version

win10

3D printer brand / version + firmware version (if known)

mk3smmu2s, 3.7.1

Behavior

Supports leave an extra gap. I had this issue well over a year ago, read about #102 #102, and a few others. Since it seemed well understood at the time, I assumed it would get fixed.

Upon further reflection, I've realized this is something the Devs are well aware of. Rather than discuss its merits as a bug - I have a suggestion/Feature request:

Several people have expected the support contact z-distance to directly express the distance from the bottom of the printed material to the supports, and the change in behavior with "detect bridging perimeters" is not only unexpected, but limiting for those times where the advanced user wants to generate tight supports while retaining the advantages of the bridging support currently available in PrusaSlicer.

As mentioned in the forum thread linked below:

Perhaps "Loose Bridge Support" should be an option which retains the current behavior, and "Tight Bridge Support" would be the version where the supports keep the same distance above bridges and non-bridges (hence leaving out weird factors of nozzle diameter, etc).

You could change either "Loose" or "Tight" to "Normal" if you prefer the term.

Note, I moved the original post to the first comment as I think it's irrelevant, this is really a feature request. Sorry for the confusion!

[AbeFM]

Original Post:

Behavior

Supports leave an extra gap. I had this issue well over a year ago, read about #102 #102, and a few others. Since it seemed well understood at the time, I assumed it would get fixed.

Here's some quick data collected:

z-contact-distance | Layer height | XY dist % of 0.2 | Support | Object | As printed Distance | Error | `

z-contact-distance Layer height XY dist % of 0.2 Support Object As printed Distance Error  
0 0.08 50 1.54 1.62 0 0  
0.001 0.08 50 1.22 1.62 0.32 0.319  
0.1 0.08 50 1.12 1.62 0.42 0.32  
0.2 0.08 50 1.02 1.62 0.52 0.32  
0.5 0.08 50 0.72 1.62 0.82 0.32  
               
z-contact-distance Layer height XY dist % of 0.2 Support Object As printed Distance Error  
0 0.1 50 1.52 1.63 0.01 0.01  
0.001 0.1 50 1.22 1.63 0.31 0.309  
0.1 0.1 50 1.13 1.63 0.4 0.3  
0.2 0.1 50 1.02 1.63 0.51 0.31  
0.5 0.1 50 0.73 1.63 0.8 0.3  
z-contact-distance Layer height XY dist % of 0.2 Support Object As printed Distance Error  
0 0.15 50 1.54 1.69 0 0  
0.001 0.15 50 1.24 1.69 0.3 0.299  
0.01 0.15 50 1.23 1.69 0.31 0.3  
0.05 0.15 50 1.19 1.69 0.35 0.3  
0.1 0.15 50 1.14 1.69 0.4 0.3  
0.2 0.15 50 1.04 1.69 0.5 0.3  
0.5 0.15 50 0.74 1.69 0.8 0.3  
               
z-contact-distance Layer height XY dist % of 0.2 Support Object As printed Distance Error  
0 0.15 5 1.54 1.69 0 0  
0.05 0.15 5 1.19 1.69 0.35 0.3  
0.1 0.15 5 1.14 1.69 0.4 0.3  
0.2 0.15 5 1.04 1.69 0.5 0.3  
0.5 0.15 5 0.74 1.69 0.8 0.3  
               
z-contact-distance Layer height XY dist % of 0.2 Support Object As printed Distance Error  
0 0.2 50 1.45 1.69 0.04 0.04  
0.001 0.2 50 1.25 1.69 0.24 0.239  
0.1 0.2 50 1.15 1.69 0.34 0.24  
0.2 0.2 50 1.05 1.69 0.44 0.24  
0.5 0.2 50 0.75 1.69 0.74 0.24  
               
z-contact-distance Layer height XY dist % of 0.2 Support Object As printed Distance Error First Layer
0 0.3 50 1.58 1.88 0 0 125%
0.001 0.3 50 1.48 1.88 0.1 0.099 125%
0.1 0.3 50 1.38 1.88 0.2 0.1 125%
0.2 0.3 50 1.28 1.88 0.3 0.1 125%
0.5 0.3 50 0.99 1.88 0.59 0.09 125%
               
z-contact-distance Layer height XY dist % of 0.2 Support Object As printed Distance Error First Layer
0 0.3 50 1.5 1.8 0 0 100%
0.001 0.3 50 1.41 1.8 0.09 0.089 100%
0.1 0.3 50 1.31 1.8 0.19 0.09 100%
0.2 0.3 50 1.21 1.8 0.29 0.09 100%
0.5 0.3 50 0.91 1.8 0.59 0.09 100%
`
or see https://forum.prusaprinters.org/forum/english-forum-general-discussion-announcements-and-releases/minimum-support-distance/#post-152704

Really I just want to know how to make the supports supportive. And I have a STRONG suggestion that the tool tips be updated to reflect that changing the "z contact distance" won't effect the "z contact distance".

As usual, if there is ANYTHING I can do to help this progress, help with the understanding, justification, etc, please let me know.

[bubnikv]

To improve quality of the object over support, we have added a new settings: "thick bridges". If enabled (that is by default), PrusaSlicer behaves as before. If disabled, bridges are printed as in any other slicer: The extrusion rate is given by the normal layer height x extrusion width * bridge flow ratio.

Implemented with ceea9de f01f021

Duplicate of #341 #4126 #2217

[ProTubeVR]

To improve quality of the object over support, we have added a new settings: "thick bridges". If enabled (that is by default), PrusaSlicer behaves as before. If disabled, bridges are printed as in any other slicer: The extrusion rate is given by the normal layer height x extrusion width * bridge flow ratio.

Implemented with ceea9de f01f021

Duplicate of #341 #4126 #2217

Hi,
Is it possible to test this ?
(sorry i don't find the build with it)

[bubnikv]

Yes, once we have the first public alpha out. pá 19. 3. 2021 v 15:25 odesílatel ProTubeVR ***@***.***> napsal:

…

To improve quality of the object over support, we have added a new settings: "thick bridges". If enabled (that is by default), PrusaSlicer behaves as before. If disabled, bridges are printed as in any other slicer: The extrusion rate is given by the normal layer height x extrusion width * bridge flow ratio. [image: image] <https://user-images.githubusercontent.com/5830947/111674988-e9ecbc80-881c-11eb-968f-de0954195229.png> Implemented with ceea9de <ceea9de> f01f021 <f01f021> Duplicate of #341 <#341> #4126 <#4126> #2217 <#2217> Hi, Is it possible to test this ? (sorry i don't find the build with it) — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#2620 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABMPSIZCB3H7ZNSH7VLIOEDTENNHDANCNFSM4IBRVD3Q> .