Rest-times-and-TSMC

[bgyarfas]

Awesome run-down on the deficiencies of the "TSMC" feature on the latest chitubox firmware (side note: worst named feature ever). I tried out your gcode suggestion on my Elegoo Saturn running V4.4.3-Z1-LCDZ and also checked the settings afterwards with

M8093 I1 
M8512 "eeprom_dump.gcode"

For the firmware running on my Saturn the factory defaults are:

M8006 I5
M8007 I2

After running your suggested values, I checked the dumped eeprom and to my surprise saw

M8006 I80
M8007 I20

My best guess is that the M8006 and M8007 commands only accept integer values and the firmware appears to floor the value to zero which in turn probably isn't a valid value so it sets it to a hardcoded default.

So ironically, the settings you were going for inadvertently made the Jerk and Max. Starting Speed higher than the default

By modifying your suggested values to

M8006 I2
M8007 I1

then they are reflected correctly in the firmware.

Not sure if this is a specific case to the Saturn but thought I'd let you know!

[sn4k3]

Yes, another user reported that on reddit: https://www.reddit.com/r/resinprinting/comments/qbfq3h/help_with_saturn_using_chitubox_19_needed_angled/

I will update the script to be I1.

BTW can you tell the difference in lifts after apply this mod?

[bgyarfas]

I just checked and sure enough if you set

M8070 S0.0
M8021 S0.0

then you can disable TSMC

[sn4k3]

Nice finding! I never tought that was possible to remove the second lift! I will add that on the template...
But the M8070 states that is the Slow rising? Meaning the first lift and not the second? M8021 states the same for retract (Last retract ie: not TSMC)?

Edit: I come down to this lines now:

M8006 I1   ; Maximum starting speed mm/s     (60mm/min) [Should be 0.7 but firmware constrains anything lower than 1]
M8007 I1   ; Jerk mm/s                       (60mm/min) [Should be 0.4 but firmware constrains anything lower than 1]
M8008 I400 ; Acceleration mm/s2
M8013 I4   ; Maximum speed of Z motion mm/s  (240mm/min)
M8016 I1   ; Second home speed: Decreasing the second home speed improve the positioning accuracy of the home limit
M8070 S0.0 ; Disable the slow rising         (Disable in firmware TSMC)
M8021 S0.0 ; Disable the slow retract        (Disable in firmware TSMC)
;M8015 T4  ; Slow maximum limit rise speed   (240mm/min)
;M8016 T4  ; Fast maximum limit fall speed   (240mm/min)
M8015 P4.0 ; Slow maximum limit rise speed   (240mm/min)
M8028 S4.0 ; Fast maximum limit rise speed   (240mm/min)
M8020 S4.0 ; Slow maximum limit fall speed   (240mm/min)
M8016 P4.0 ; Fast maximum limit fall speed   (240mm/min)


M8500      ; Save configuration permanently

[bgyarfas]

But the M8070 states that is the Slow rising? Meaning the first lift and not the second?
I think that's right.

I'm pretty confident since the ctb file I used to test whether or not I saw a "second" speed had the following entries set to 0

2) Bottom Lift Height
2) Lift Height
2) Bottom Retract Height
2) Retract Height

And I would see a change in the movement speed if I changed the other Retract/Lift Speeds (all without a second speed during a lift/retract)

It's a shame this version of the motherboard isn't using a motor driver like the TMC5041, then it could have proper acceleration/deceleration profiles... Currently, I've set my acceleration to I10 and it has a real nice acceleration/deceleration for the lift/retract but I wish on the opposite end (i.e. when the platform is high) the deceleration was more abrupt since it's just wasting time slowing down for no reason.

[sn4k3]

OK i have test it, and it works, i also put I10 accel as 400 produce same high speeds.

it has a real nice acceleration/deceleration for the lift/retract but I wish on the opposite end

Thats true, but you asking for to much 🤣
It's a shame we can't configure all parameters we like, thats the big down side of closed firmwares, we are stuck with what is given and old machines will never see a update either.

I updated file again

[bgyarfas]

Awesome. Thanks again for working on UVTools, I'm really enjoying it 🥇