No Accelerometer in mk4 but connector present in the mainboard.  

RE: No Accelerometer in mk4 but connector present in the mainboard.

Posted by: @thejiral

 Indeed. But leaving out the accelerometer when the addition is actually faciliated somehow makes even less sense. Those components are small, lightweight and don't cost much. I am a bit lost here too. 

I do have input shaper on my Voron 0.1, calibrated with an ADXL. The difference in print quality with input shaper is like day and night. I also think to see a slight degradation in results after having not recalibrated for quite a while, even though slight details have changed. 

Like I said, this would necessitate a thorough review in different resonance setups (LACK, concrete slab, concrete slab on solid table etc) to see how much of a difference it does make in practice. 

Did a quick check on line for accelerometers and you can get an Adafruit 3 axis module for less than $10 as a single item.  If ordering enough chips, they are less than $1 each in quantity.  If you are building a board with connectors, much of the cost is already accounted for.  May be a future upgrade option.

RE: No Accelerometer in mk4 but connector present in the mainboard.

I worked in the computer chip industry for 16 years and built and calibrated computer manufacturing instruments that could drive 8 inch's and be within 1/4 micron.  We used to build a customer system profile including accelerometer data.  In the field if FSE's did not keep backups up to date and the computer crashed we could send a generic profile that was good enough to get the system up and running and the FSE could then go and do all the calibrations.  Some lazy FSE's would just install the generic profile and put the instrument back into production.  It may not be the best running instrument but it would run.  I would fly out to customer sites to fill in for vacations or for long tool down situations and when I would see this it would drive me nuts.  But the moral of the story is it looks like Prusa has a baseline or generic setting that seems good enough.  Probably 99.9% of printers will run fine with this setting. I am sure Prusa has taken this into account but they are selling into a lot of tinkers and moders so they will not settle for "good enough". 

s

RE: No Accelerometer in mk4 but connector present in the mainboard.

Unless Prusa intend to sell the required sensor as an ‘add-on’ part to be used alongside input shaper?

Or maybe manufacturer delays of some sort meaning they decided to omit the sensor by default??

Clutching at straws here….!

RE: No Accelerometer in mk4 but connector present in the mainboard.

To make it possible to print fast in various setups (the frequencies differ depending on how heavy is the filament spool, for example) while being really simple for users (especially new users), the printer should come with two accelerometers, one mounted on the head and one on the bed. This way users could measure frequencies before every print if they want, or better just from time to time or if something is changed. The rest of the printer is reliable and self-calibrating, thus easy to use even for inexperienced users, why not make this too?

RE:

I never tried that test print method but it seems to be a legit one and can yield good results too. It is a lot more hassle then if you have inbuilt sensors and the machine can do it automatically though. 

I agree that this is not the best option but it would be a viable alternative at least. For that there needs to be an easy way to enter the calibration values at the printer though. Either that or via Slicer.

PS: I never put the filament spool on the printer for exactly that reason. It just puts a highly variable weight on the printer where I don't wont it to be. Which is why the spools are decoupled from the printer itself.  

RE: No Accelerometer in mk4 but connector present in the mainboard.

That is the point I don't get. With two integrated sensors, Prusa could have made the calibration process fully automatic and therefore totally easy to use even for complete beginners. Even if this calibration were only don't by default with initial setting up of the printer, it would be fine (with the option to do it manually anytime via some menu option). The cost of the sensors is negligible. 

I would not encourage calibration before each print or put a warning message at that option as you are seriously shaking your printer apart with that. 

RE:

The only thing I can think of here is that this is the MK4, and for features like this we will get bent over into buying more stuff from Prusa when it becomes an "upgrade" to the MK4S - even though it was marketed to have input shaping in the first place >.<

Honestly I really don't want to have to take apart my extruder or any other part of my assembled MK4 to add a sensor.  That just negates the extra $200 I spent or whatever it was.