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First support layer does not stick to bed #2101

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espr14 opened this issue Apr 11, 2019 · 4 comments
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First support layer does not stick to bed #2101

espr14 opened this issue Apr 11, 2019 · 4 comments
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@espr14
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espr14 commented Apr 11, 2019

1.42.0 b1

There are 2 issues with first layer of support:

  1. Sparse infill
  2. Sharp corners

Space between lines decreases adhesion while sharp corners tend to bend during cooling. This picture is taken after print with very well cleaned bed. Such clean bed does not cause any bending of brims or printed part. Without extra cleaning the support makes printing impossible.

IMG_20190409_181040_crop

Solution:

  1. provide setting for infill density for the first layer of support
  2. pick (automatically) angle of infill so the number of corners is as low as possible
  3. turn sharp corners to rounded ones

support corners
@espr14
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espr14 commented Apr 13, 2019

#1165

@espr14
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espr14 commented Apr 21, 2019

Hotfix:

  1. Enable brim
  2. Set support XY separation to 200% or more (this will get brim between support and object)

Solution proposal:

  1. Add perimeters for support (enable/disable, width, height - for flex) so you can print object without brim but to print support with first (few) layers with perimeters (brim, sheath).
  2. Allow changing infill type and density for first layer, intermediate layers and support interface.
  3. Allow building support on objects's brim.

@espr14 espr14 mentioned this issue Apr 23, 2019
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@tkircher
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This is also related to #1156

etphipp added a commit to etphipp/PrusaSlicer that referenced this issue Dec 9, 2019
@etphipp
Add setting for controlling density of first layer support lines.
108af12 
This adds a setting under "Print Settings" for controlling the density
of first layer support lines, which previously was hard-coded to 0.5.
Changing it to 1.0 yields a solid first layer and making it less than
0.5 yields even sparser support lines resulting in fewer corners.

Frankly the first layer adhesion of the textured metal sheets is not
great and really struggles with small features on the print bed.  This
is exacerbated by the first layer support pattern with its very sharp
angles.  This change gives the user the option to increase the density
to get a solid support layer for better adhesion, or to decrease the
density and reduce the number of sharp corners.

Partially addresses issue prusa3d#2101.
@etphipp etphipp mentioned this issue Dec 9, 2019
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@rtyr rtyr mentioned this issue Jul 29, 2020
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bubnikv added a commit that referenced this issue Feb 24, 2021
@bubnikv
Added a single perimeter to the first layer of support or raft.
fcb714c 
Fixes [Request] Add optional perimeter to raft #756
Fixes First support layer does not stick to bed #2101

New parameters raft_first_layer_density and raft_first_layer_expansion
to influence the 1st layer of raft or support.
Fixes Allow to disable raft under support structures. #3772
Fixes raft is larger than necessary #2568
Fixes Supports on the build plate should have a solid bottom interface for better adhesion #1165

Changed the 1st layer infill to rectilinear even for soluble materials.
Fixes first layer of support for multi filament support oddly spaced #1445
Fixes Full Soluble Materials interfacing into Models + Soluble material noise on Bed #684
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bubnikv commented Feb 24, 2021

Implemented with fcb714c

The 1st layer support or raft will always have a perimeter drawn around it to improve support adhesion.

Also there will be new parameters raft_first_layer_density and raft_first_layer_expansion
to influence the 1st layer of raft or support.

@bubnikv bubnikv closed this as completed Feb 24, 2021
@bubnikv bubnikv mentioned this issue Feb 24, 2021
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@bubnikv bubnikv mentioned this issue Aug 6, 2021
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@mildred mildred mentioned this issue Aug 27, 2021
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@bubnikv @tkircher @espr14