Ive calibrated the machine to correct the X / Y using the M92 command all square prints are printing within "approved" limits (for now atleast) But as soon as i print anything containing any typ of circle arc or something resembling a circle something odd happens everything looks squished like lemons, it begin good but somewhere along 80% it decides to stop the arc and print a line, it also seems like the "circle" pattern superseeds all other patterns, i tried to print a nut & bolt but the whole print was horribly deformed and the circle pattern didnt come into play until layer 8 ? or something like that. ive tried using the --gcode-arcs option but same results (ive enabled it in the firmware) when i analyze the model in any stl reader it looks right, and the gcode also seem to read correct as the layer processor displays the circle like it should look. Changing the location on the print surface doesnt seem to help. im currently running pronterface as the host software and slic3r as gcode generator im using a mac with lion, but ive also tried printing from an sd card and a windows version of the same software with same futile results. Current firmware sprinter but ive hade the same problems with the factory firmware (not sure but i think its marlin?) ive included some photos of some of the malformed prints. [attachment 12703 Circle1.jpg] [attachment 12704 circle2.jpg] any ideas on what could be causing the problems? or how to solve it? https://reprap.org/forum/read.php?1,185641,185641#msg-185641 Thu, 16 Apr 2026 13:56:00 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,185641,194868#msg-194868 https://reprap.org/forum/read.php?1,185641,194868#msg-194868
I would like to thank everyone for your time and help.]]> PimpKittah General Mon, 25 Mar 2013 15:18:52 -0400 https://reprap.org/forum/read.php?1,185641,187425#msg-187425 https://reprap.org/forum/read.php?1,185641,187425#msg-187425
Btw the gen 3 mendel reprap i bought parts from you a couple of years ago still runs :)]]> PimpKittah General Mon, 25 Feb 2013 03:35:40 -0500 https://reprap.org/forum/read.php?1,185641,187361#msg-187361 https://reprap.org/forum/read.php?1,185641,187361#msg-187361

also is your y belt tight?

may have been asked earlier, but when i had the above happen to me a few years ago, the drivers had the wrong multiplier for y.]]> jamesdanielv General Sun, 24 Feb 2013 18:33:08 -0500 https://reprap.org/forum/read.php?1,185641,187256#msg-187256 https://reprap.org/forum/read.php?1,185641,187256#msg-187256 xiando General Sun, 24 Feb 2013 10:28:55 -0500 https://reprap.org/forum/read.php?1,185641,187249#msg-187249 https://reprap.org/forum/read.php?1,185641,187249#msg-187249
Your X axis is pausing whenever the direction changes. It is less noticeable on a rectangle because only one axis moves at a time, but the X dimension will be too short. You may have increased the steps per MM to make a rectangle the right size but I think you will find that if you print two different size rectangles they wont both have the correct X dimension.

Try printing a cross. I think you will find the vertical arms don't line up with each other but the horizontal arms do. There are several backlash tests on Thingiverse.

It is classic backlash and must be a mechanical problem. Either something is loose, or something is binding so much it stretches the belt / displaces the motor position. When it changes direction the stretch is then other way so you get an error of twice the stretch.

I have seen the same pattern from loose pulleys, slack belts, belts binding on the penny washers, worn out bushings that allowed the carriage to rotate as it changed direction and a loose nozzle which moved as it brushes over the plastic it has laid down. I have never seen it from firmware or electronics.]]> nophead General Sun, 24 Feb 2013 10:06:11 -0500 https://reprap.org/forum/read.php?1,185641,187239#msg-187239 https://reprap.org/forum/read.php?1,185641,187239#msg-187239
And judging from the shapes it seems like it slacks off on the x axis hence it produces straight lines along the Y axis when it "squishes"

might this be a faulty driver IC ?

anyone got a firmware to recommend for printrboard?]]> PimpKittah General Sun, 24 Feb 2013 09:20:24 -0500 https://reprap.org/forum/read.php?1,185641,187221#msg-187221 https://reprap.org/forum/read.php?1,185641,187221#msg-187221 xiando General Sun, 24 Feb 2013 08:13:42 -0500 https://reprap.org/forum/read.php?1,185641,187175#msg-187175 https://reprap.org/forum/read.php?1,185641,187175#msg-187175 karabas General Sun, 24 Feb 2013 03:21:34 -0500 https://reprap.org/forum/read.php?1,185641,187166#msg-187166 https://reprap.org/forum/read.php?1,185641,187166#msg-187166
Odd thing about this problem is that it always seem to occur at the end of the arc movement never in the begining.

and the machine is a printrbot jr, currently running sprinter.]]> PimpKittah General Sun, 24 Feb 2013 01:16:00 -0500 https://reprap.org/forum/read.php?1,185641,187114#msg-187114 https://reprap.org/forum/read.php?1,185641,187114#msg-187114 waitaki General Sat, 23 Feb 2013 16:14:09 -0500 https://reprap.org/forum/read.php?1,185641,187070#msg-187070 https://reprap.org/forum/read.php?1,185641,187070#msg-187070
Or while stationary try moving the carriage by hand. The motor should hold it in place. If you can move it a significant distance something is loose.]]> nophead General Sat, 23 Feb 2013 11:41:23 -0500 https://reprap.org/forum/read.php?1,185641,187058#msg-187058 https://reprap.org/forum/read.php?1,185641,187058#msg-187058 Dirty Steve General Sat, 23 Feb 2013 10:50:09 -0500 https://reprap.org/forum/read.php?1,185641,187051#msg-187051 https://reprap.org/forum/read.php?1,185641,187051#msg-187051
Also tried tampering on the screw for motor power but still same issue any other ideas?]]> PimpKittah General Sat, 23 Feb 2013 10:28:18 -0500 https://reprap.org/forum/read.php?1,185641,185706#msg-185706 https://reprap.org/forum/read.php?1,185641,185706#msg-185706
If using machined pulleys or gears, one can simply apply loctite to secure the screw.]]> xiando General Mon, 18 Feb 2013 14:58:43 -0500 https://reprap.org/forum/read.php?1,185641,185701#msg-185701 https://reprap.org/forum/read.php?1,185641,185701#msg-185701 Dirty Steve General Mon, 18 Feb 2013 14:43:34 -0500 https://reprap.org/forum/read.php?1,185641,185683#msg-185683 https://reprap.org/forum/read.php?1,185641,185683#msg-185683 xiando General Mon, 18 Feb 2013 12:56:17 -0500 https://reprap.org/forum/read.php?1,185641,185680#msg-185680 https://reprap.org/forum/read.php?1,185641,185680#msg-185680 Dirty Steve General Mon, 18 Feb 2013 12:46:44 -0500 https://reprap.org/forum/read.php?1,185641,185655#msg-185655 https://reprap.org/forum/read.php?1,185641,185655#msg-185655
rod or bearing or intruded crud or alignment...any or all could cause the translation mechanism to stick, in either the bed (Y) or the extruder (X). So check 'em all.]]> xiando General Mon, 18 Feb 2013 11:23:02 -0500 https://reprap.org/forum/read.php?1,185641,185651#msg-185651 https://reprap.org/forum/read.php?1,185641,185651#msg-185651
2) if this was a rod problem the outcome would be different depending on where on the bed i printed it but i always get the same outcome :(

any other ideas?]]> PimpKittah General Mon, 18 Feb 2013 11:11:19 -0500 https://reprap.org/forum/read.php?1,185641,185647#msg-185647 https://reprap.org/forum/read.php?1,185641,185647#msg-185647
1) missing steps. Check your ?X ?Y drivers to make sure they're not over or underdriven
2) binding in the bearings. check to ensure alignments are correct, smooth rods are undeformed, and sliding friction is low across the full translation.]]> xiando General Mon, 18 Feb 2013 10:58:46 -0500 https://reprap.org/forum/read.php?1,185641,185641#msg-185641 https://reprap.org/forum/read.php?1,185641,185641#msg-185641
But as soon as i print anything containing any typ of circle arc or something resembling a circle something odd happens
everything looks squished like lemons, it begin good but somewhere along 80% it decides to stop the arc and print a line, it also seems like the "circle" pattern superseeds all other patterns, i tried to print a nut & bolt but the whole print was horribly deformed and the circle pattern didnt come into play until layer 8 ? or something like that.

ive tried using the --gcode-arcs option but same results (ive enabled it in the firmware)

when i analyze the model in any stl reader it looks right, and the gcode also seem to read correct as the layer processor displays the circle like it should look.

Changing the location on the print surface doesnt seem to help.

im currently running pronterface as the host software and slic3r as gcode generator
im using a mac with lion, but ive also tried printing from an sd card and a windows version of the same software with same futile results.
Current firmware sprinter but ive hade the same problems with the factory firmware (not sure but i think its marlin?)

ive included some photos of some of the malformed prints.
[attachment 12703 Circle1.jpg]
[attachment 12704 circle2.jpg]

any ideas on what could be causing the problems? or how to solve it?]]> PimpKittah General Mon, 18 Feb 2013 10:51:17 -0500