Prusa i3 Aluminium unexpected motion problem

balearic.dynamics
Posts: 8
Joined: Sun Jan 03, 2016 8:59 pm

Re: Prusa i3 Aluminium unexpected motion problem

Post by balearic.dynamics » Wed Jan 06, 2016 5:49 pm

I am supposing the same. Or a problem related to the wrong management of long / integers during compilation, wrong casting or similar. Now I am doing a counter-test:

Set the slicer feed rates to almost absurd values, like 1 and 2 Then the result in the generated gcode is between acceptable ranges. If this work, I will try to modify the firmware feedrate calculation simplifying the formula and splitting it in more parts.

As I have finished the test cycles I will post an update anyway.

Enrico

balearic.dynamics
Posts: 8
Joined: Sun Jan 03, 2016 8:59 pm

Re: Prusa i3 Aluminium unexpected motion problem

Post by balearic.dynamics » Fri Jan 08, 2016 6:21 pm

Mark,

Now setting these low values the printer moves. Not fine because the values are too low in some cases but the problem on the z-axis occurs only when there is normal feedrates set in the slic3r with the Repetier host (take in account that I have saved the various kind of slic3r settings.

Exploring the firmware Medel_main.cpp it seems that for some strange reason the feedrate forumla

Code: Select all

feedrate/60 
does not do the float division correctly. And this has not so much sense for me.

Hope you can suggest something else...

Thank you. Enrico

Mark
Posts: 1553
Joined: Thu Aug 06, 2015 9:19 am

Re: Prusa i3 Aluminium unexpected motion problem

Post by Mark » Sat Jan 09, 2016 3:43 pm

sorry don't quite familiar with the firmware and formula...guess the mainboard is faulty somewhere...

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