[solved] Only 7 steps per mm extrusion? I have an older reprappro mendel that I just finished putting together. I updated the firmware on it to the latest marlin. I also have the latest pronterface. When I tested the extrusion, it extrudes 90mm for every 1mm. That is, if I try to extrude 1mm at 300mm/sec using pronterface, it extrudes 90mm very slowly. The settings in the firmware are still default (660 steps per unit for E axis). According to the calculation on the calibration wiki page, the steps should be (current setting * expected length) / actual length = new steps per mm. That calculation gives 7.333 steps per mm, but when I try that, I get an error saying that I am trying to extrude too much. It seems that 7.33 steps per mm is awfully low. Does anyone have any clue what could be going on? Thanks. https://reprap.org/forum/read.php?151,239333,239333#msg-239333 Mon, 05 Oct 2026 19:36:45 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?151,239333,239656#msg-239656 Re: Only 7 steps per mm extrusion? https://reprap.org/forum/read.php?151,239333,239656#msg-239656 bob General Mendel Topics Sun, 25 Aug 2013 18:53:58 -0400 https://reprap.org/forum/read.php?151,239333,239444#msg-239444 Re: Only 7 steps per mm extrusion? https://reprap.org/forum/read.php?151,239333,239444#msg-239444 jkoljo General Mendel Topics Sun, 25 Aug 2013 05:17:35 -0400 https://reprap.org/forum/read.php?151,239333,239352#msg-239352 Re: Only 7 steps per mm extrusion? https://reprap.org/forum/read.php?151,239333,239352#msg-239352 bob General Mendel Topics Sat, 24 Aug 2013 20:11:38 -0400 https://reprap.org/forum/read.php?151,239333,239348#msg-239348 Re: Only 7 steps per mm extrusion? https://reprap.org/forum/read.php?151,239333,239348#msg-239348 nophead General Mendel Topics Sat, 24 Aug 2013 19:50:32 -0400 https://reprap.org/forum/read.php?151,239333,239333#msg-239333 [solved] Only 7 steps per mm extrusion? https://reprap.org/forum/read.php?151,239333,239333#msg-239333
(current setting * expected length) / actual length = new steps per mm.

That calculation gives 7.333 steps per mm, but when I try that, I get an error saying that I am trying to extrude too much. It seems that 7.33 steps per mm is awfully low. Does anyone have any clue what could be going on?

Thanks.]]> bob General Mendel Topics Sat, 24 Aug 2013 18:53:16 -0400