Editing location of Z probing points
I'm looking to build a larger scale printer and want to use some of the same components as the Mk3 like extruder build, einsy, power supply and LCD but I also want to maintain the 9 point calibration sequence at the beginning of every print. Maybe even the XY calibration. I was wondering if anyone knows how to access the coordinates of those points and I can reposition them in the firmware to fit the new printer. Another problem I will encounter is using a larger pulley size will change the steps per millimeter and I don't want to have to add an M code to custom gcodes in Slic3r, generated by the prusa calculator online because it seems very tedious. If you could give any advice or maybe a link to a tutorial I couldn't find that would be amazing.
Re: Editing location of Z probing points
Hi Beth,
I am not a programmer so cant help with the sense points...
but why change the pulley size? the current size should work fine!
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: Editing location of Z probing points
but why change the pulley size? the current size should work fine!
Joan, don't you know that bigger is always better 😉
There are a few parameters that will need changing, just for the larger size:
// Travel limits after homing
#define X_MAX_POS 255
#define X_MIN_POS 0
#define Y_MAX_POS 212.5
#define Y_MIN_POS -4 //orig -4
#define Z_MAX_POS 210
#define Z_MIN_POS 0.15
Steps are set here:
// Steps per unit {X,Y,Z,E}
#define DEFAULT_AXIS_STEPS_PER_UNIT {100,100,3200/8,280}
These are in Configuration_prusa.h
Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…
Re: Editing location of Z probing points
Hi Peter,
I always thought it was more a matter of what you do with it, than size....
larger drive wheels on the steppers may offer increased travel speeds but almost certainly will reduce the potential detail on the respective axis.
The mass of the items moving on the axes is liable to be greater on a larger printer, so the effort provided by the stepper motors may necessitate larger stepper motors, more power etc. and larger drive wheels is likely to make that power requirement even greater
I see people using 0.9 degree steppers to increase definition and reduce artefacts. larger printers are likely to have larger, probably heavier extruder's and as such be more susceptible to bigger artefacts.
However I am outside the design loop so these are suppositions...
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: Editing location of Z probing points
I am planning to use an e3dV6 cloned volcano so I don't think it will be too much heavier, but because Peter said nothing about changing the location of the problem points are they not editable? I haven't had a chance to scroll through the source code.
Re: Editing location of Z probing points
... because Peter said nothing about changing the location of the problem points are they not editable?
I just went for the easy bits. Yes, the probing points are compiled within the firmware; you just have to find them.
Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…