This PR tries to address the 3 different startup scenarios for 1st layer calibration with the MMU:
- 1st lay cal started with correct filament already loaded in the nozzle - we should continue, but skip the first 58mm (first 2 g-codes in the hard coded sequence) of purge line extrusion
- 1st lay cal started with other filament already loaded in the nozzle - we should unload and then issue a toolchange with no extra unload
- 1st lay cal started without loaded filament - we should just do a toolchange with no extra unload
PFW-1457
This is a prototype implementation of having the ability to show an MMU error screen even for printer's errors (during an MMU operation).
Also, the retry count of unloads after failed load the extruder tube is now limited to ~3 attempts.
Technically, since this very error is not an MMU's one (MMU is just fine at this stage) but a printer's one I tried to hack the existing error-reporting infrastructure to handle such a case.
The original idea of this approach was suggested by @vintagePC
The Extra Loading Distance is configurable by the user.
We need to compensate the hardcoded sequence
such that it does not extrude too much or
too little. Currently the firmware
extrudes too little.
Fixes issue where First Layer Cal. triggers an unload before any
filament is loaded
The purpose of this if() statement is to handle the case where
a user or developer is sending T-codes to the printer directly
via Serial. Such as when one first sends T0 and then T4.
And unload must be triggered in-between, we can do this automatically
if FINDA detect filament.
Change in memory:
Flash: -10 bytes
SRAM: 0 bytes
This piece just changes the default extra load length on the MK3 side.
The same needs to be done on the MMU side but:
- the MMU exposes its register for this (so we can change the extra load distance by writing into the register via G-code)
- the printer shall probably set this value on its own after line up of MMU communication
I had a crash when producing an error screen and printer was unhomed.
Extruder was located at the far right side, and immediately crashed when attempting to park.
Since mmu_loop() is called in the main loop() function
when the MMU is disabled, we need to utilise the
MMU protocol layer to prevent FINDA runout from happening
if MMU is disabled.
We also need to keep in mind we probably can't trigger
a FINDA runout in the middle of a Q0 query.
So my solution now is to wait for the "Finished" state
and check if the FINDA is off during printing.
When "Finished" state appears, the FINDA value should be up
to date.
This fixes an issue where the assumed slot to use is unknown and
the printer will hang on loading filament 100.
Another good thing is this is an old user feature request which
we have in our 3.12 milestone.
Change in memory:
Flash: +14 bytes
SRAM: -1 bytes
Don't start moving the E-motor immediately
Instead of starting the E-motor move when the load to extruder starts,
we can start when we are loading to the fsensor. At that stage
the MMU has changed from a fast load to a slow load.
This is a draft PR showing the potential 3x retry implementation on the printer's side.
It is much less code and looks more reliable than the same functionality in the MMU FW.
Still, more work needs to be done:
- [ ] Button is sent to the MMU even before returning from the parking position
- [ ] Then the button is sent again
- [ ] Then the printer runs out of retryAttempts
We need to find a better spot to check for "automatic" retry and issuing of the buttons
* Fix MK3S buttons being processed too slowly
After a button is selected on the MK3S MMU error screen, we need to process it before asking for another MMU Query.
Because the MMU Query will make the Error screen return and overwrite the status screen
* Add back CheckUserInput for ButtonPushed event
When a FSENSOR error happens, the first step for the MK3S should be to stop any loading by stopping the E-motor.
From this point, the buttons should determine what the MK3S does next.
D.R.racer
Alex Voinea
Guðni Már Gilbert
VintagePC
3d-gussner
Yuri D'Elia