Does it affect modified Mini+ with Direct Drive?
As the title states, how does the new input shaper firmware for the mini+ affect those with a direct drive upgrade or does it? Specifically the sherpa mini. Has anyone tested it yet? I also have a revo mini but have read that most with this upgrade have not seen any negative impacts.
RE: Does it affect modified Mini+ with Direct Drive?
As an unproffesional reply I had a look at the IS values (currently alpha). Coming from a sppenmonster in the form of a RatRig 200 AWD 48V I still find the x values of the Mini... obscene? I cannot think a way to even run into the IS short of using the x gantry as linear rail gun. 132 Hz would come into effect around 50 k acc? So, I guess, even with PrusaSlicers alpha Mini profile you won´t run into issues.
As for y... no effect here for sure, with thirtyish MZV not a bringer, but not reachable anyway with a bed pusher
RE: Does it affect modified Mini+ with Direct Drive?
I run it since yesterday on a Prusa mini with direct drive. I only change my values for retract distance and retract speed and thats all. The steps for extruder are already changed in the hidden option from the prusa mini.
The prints are 40% faster and looks very great.
RE: Does it affect modified Mini+ with Direct Drive?
You certainly cannot use stock pressure advance values.
RE: Does it affect modified Mini+ with Direct Drive?
Will these settings translate over to Mini upgraded to Bear with Mk3 extruder?
Yes thats correct, I take the values from the MK4 with pressure advance.
Standart value was M572 S0.3 (Mini with Bowden extruder and 0.4mm) and I changed to M572 S0.038 ( MK4 with direct extruder and 0.4mm nozzel)
RE: Does it affect modified Mini+ with Direct Drive?
Yes I think so, if you have a 0.4mm nozzel
RE: Does it affect modified Mini+ with Direct Drive?
Seems to work pretty good with default SPEED profile (140mm/s) and baked IS values on my direct drive mini with IGUS rods and bearings upgrade.
Had to remove any LA commands from filament profiles and slightly tweak the printer profile gcode to match my steps. With a quick PLA@225c and 140mm/s test the pressure advance value seem to be around 0.01. maybe 0.02 for petg?
RE:
How did you set Pressure Advance?
Pressure Advance: M572 Sxxx.xxxx
Linear Advance: M900 Kx.xxx
I tried turning off Linear Advance and only use Pressure Advance (setting from MK4), but that did not work nicely.
Seems to work pretty good with default SPEED profile (140mm/s) and baked IS values on my direct drive mini with IGUS rods and bearings upgrade.
Had to remove any LA commands from filament profiles and slightly tweak the printer profile gcode to match my steps. With a quick PLA@225c and 140mm/s test the pressure advance value seem to be around 0.01. maybe 0.02 for petg?
RE:
Ok, i found this in the MK4 filament gcode:
M900 K{if nozzle_diameter[0]==0.4}0.05
{elsif nozzle_diameter[0]==0.25}0.14
{elsif nozzle_diameter[0]==0.3}0.07
{elsif nozzle_diameter[0]==0.35}0.06
{elsif nozzle_diameter[0]==0.6}0.03
{elsif nozzle_diameter[0]==0.5}0.035
{elsif nozzle_diameter[0]==0.8}0.015
{else}0{endif} ; Filament gcode
M572 S{if nozzle_diameter[0]==0.4}0.038{
elsif nozzle_diameter[0]==0.5}0.025
{elsif nozzle_diameter[0]==0.6}0.02
{elsif nozzle_diameter[0]==0.8}0.014
{elsif nozzle_diameter[0]==0.25}0.12
{elsif nozzle_diameter[0]==0.3}0.08
{else}0
{endif} ; Filament gcode
This means still LA for 0.4 nozzle on MK4, but not on the Mini
Unfortunately this did not work for my Mini Bear
I'll try to modify the Ellis test for Pressure Advance instead of Linear Advance
RE: Does it affect modified Mini+ with Direct Drive?
are you using new printer profiles? that is baked into printer and filament profiles. though values are tuned for bowden, so would need changing.
RE: Does it affect modified Mini+ with Direct Drive?
Yes, i just saw.
I now turned off LA and using PA only.
I accidently added the gcode to the printer setting
Working fine now, better than LA !
RE: Does it affect modified Mini+ with Direct Drive?
How did you turn off LA? Comment out the M900 commands? Do you mind sharing your PA settings for your Mini Bear? Thank you!
Yes, i just saw.
I now turned off LA and using PA only.
I accidently added the gcode to the printer settingWorking fine now, better than LA !
RE:
LA is always set in filament gcode.
Remove everything there and set:
M900 K0 ;Disable Linear Advance M572 S0.038 ;Set Pressure Advance. This value is for Mk4 DirectDrive extruder
RE: Does it affect modified Mini+ with Direct Drive?
Thank you! By the way which configuration preset did you use in Prusa Slicer, the Mini or the Mk4 ?
LA is always set in filament gcode.
Remove everything there and set:
M900 K0 ;Disable Linear Advance M572 S0.038 ;Set Pressure Advance. This value is for Mk4 DirectDrive extruder
RE:
You don't have to disable LA by M900 K0 command. Just use M572 S alone.
Also (side note), the firmware automatically converts "M900 K" commands to M572 S.
RE:
Any idea how that conversion works?
What would be the M572 equivalent for M900 K0.03 ?
Because i know my LA, but not my PA.
Best for me would be to stick with my LA then...
RE: Does it affect modified Mini+ with Direct Drive?
After taking a better look, the values are quite close, seems PA is a bit lower.
I could use the ellis test with an M572 instead of M900. Should work.
RE:
Yeah, for your M900 K0.03 you would probably go 0.01 or 0.005 for PA.
I was a bit surprised to hear that apparently firmware would convert M900 commands to M572. sorta handy in theory but probably a recipe for disaster in practice
After taking a better look, the values are quite close, seems PA is a bit lower.
I could use the ellis test with an M572 instead of M900. Should work.
RE: Does it affect modified Mini+ with Direct Drive?
I may have missed it in the previous posts, but I just updated to the new firmware on the mini+ and while I'm able to print, they don't look as good as they did prior to input shaper. It appears I'm getting under extrusion on some corners and seams, also supports. I'm still using a revo micro and a sherpa DD. The Custom GCode for my filament settings is "M900 K0.05 ; Filament gcode" and only thing I've added to the default Input Shaper printer profile is my PID settings and the below.
M603 L80 U80 ;set the load/unload filament length
M906 T0 E600 ;set current for the extruder motor
Aside from that, all the other profile settings are default. Any ideas what I should change?
RE: Does it affect modified Mini+ with Direct Drive?
Here are pics of what I am referring to. Prior to input shaper, this was not a problem. The straight line on the inside is the seam.
