How does it work?
I built my Mini from the semi-assembled kit. If there was an accelerometer in there, I must have blinked and missed it. So how does the Mini decide on the amount of Input shaping required? Is it just guestimating it on the fly, according to a fixed algorithm? If so, is it possible that the I3 will get input shaping at some point in the future?
Basically Yes, and No, the I3 cpu doesn't have enough power.
Cheerio,
RE:
You can print a ringing tower which increases the frequence every layer. Based on that you can calculate the best result to a new frequency and put that in your start gcode.
This is exactly the same thing as an accelerometer does, but automatically.
The latest version of Marlin does support Input Shaping, so in theory it should be possible, but you have to recompile the buddy-firmware yourself.
I think there is a how-to from Chris Riley on youtube how to do this.
RE:
To reply on your question if this is guestimating or fixed algorithm.
My guess would be is that Prusa made this ringing tower, calculated these frequencies and put them as fixed values for all Mini's
RE: How does it work?
But what if you have modded your frame (Bear)? and some of us use the E3D RapidChange Revo™ HotEnds. Does the Input Shaper still work as planned?
RE:
Default settings are calculated do default printer configuration.
If you change anything in the printer that it changes mass on moving elements - like different print head such as Revo, custom blowers or fans, or bear mod, etc - then you should run recalibration tower and choose the best values that suits you best.
See https://forum.prusa3d.com/forum/input-shaper-mini/changing-the-defaults-for-input-shaping/ for more.
You do not need to have accelerometer to use it. Mini does not have one. That's why it needs to be manually tested and applied in configuration.
See my GitHub and printables.com for some 3d stuff that you may like.