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firmware_retract: Remove z_hop support

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The current z_hop support did not work correctly with common slicers
that change Z height between retract and unretract, and it did not
work correctly with slicers that issue a retract at the end of a print
and then at the beginning of the next print.

The z_hop support is therefore being removed until these issues can be
fixed.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-07-10 19:25:56 -04:00
parent 364c22fe84
commit 0343d0c73a
4 changed files with 17 additions and 31 deletions
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17
docs/G-Codes.md
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@ -457,18 +457,15 @@ stringing during non-extrusion moves from one part of the print to
another. Appropriately configuring pressure advance reduces the length
of retraction required.
- `SET_RETRACTION [RETRACT_LENGTH=<mm>] [RETRACT_SPEED=<mm/s>]
[UNRETRACT_EXTRA_LENGTH=<mm>] [UNRETRACT_SPEED=<mm/s>] [Z_HOP=<mm>]`:
Adjust the parameters used by firmware retraction. RETRACT_LENGTH
determines the length of filament to retract and unretract. The
speed of retraction is adjusted via RETRACT_SPEED, and is typically
set relatively high. The speed of unretraction is adjusted via
[UNRETRACT_EXTRA_LENGTH=<mm>] [UNRETRACT_SPEED=<mm/s>]`: Adjust the
parameters used by firmware retraction. RETRACT_LENGTH determines
the length of filament to retract and unretract. The speed of
retraction is adjusted via RETRACT_SPEED, and is typically set
relatively high. The speed of unretraction is adjusted via
UNRETRACT_SPEED, and is not particularly critical, although often
lower than RETRACT_SPEED. In some cases it is useful to add a small
lower than RETRACT_SPEED. In some cases it is useful to add a small
amount of additional length on unretraction, and this is set via
UNRETRACT_EXTRA_LENGTH. It is possible to lift the Z axis by a small
amount when in retracted state by setting Z_HOP, although this is
more commonly used for printers where fast Z movements are supported,
such as delta printers. SET_RETRACTION is commonly set as part of
UNRETRACT_EXTRA_LENGTH. SET_RETRACTION is commonly set as part of
slicer per-filament configuration, as different filaments require
different parameter settings.
- `GET_RETRACTION`: Queries the current parameters used by firmware