![]() ![]() Also known as Extrusion Multiplier, by calibrating the flow rate you can fix issues caused by under-extrusion or over-extrusion. The flow rate calibration is done in order to fine tune the amount of plastic extruded by the printer. I assume some settings, like wipe during retract, will be incompatible with firmware retraction, and there may be other combinations of settings that won’t work.4 Wrapping Up Why do the Flow Rate Calibration? These post processing commands have been working for me, but I haven’t tried them with all the different retraction setting permutations. ![]() M208 S0 F600 set retraction recover speed / adjustments ![]() M207 S1.0 F6000 Z0 set retraction length / speed These M207 and M208 gcodes are also the ones you would use if you want to use if you’re want to tune your retraction mid print. If you’re using firmware retraction, you may want to add configuration gcode in your startup script, then edit these values to adjust your retraction settings. Some firmwares may use different gcodes for firmware retraction, check the reprap gcode page for more info. There is an option with some firmwares to autodetect slicer generated retraction and replace it with the firmware values (M209), which might be an easier way to enable retraction gcode, but my printers don’t support it. So the the third replace is to fix update that one line, without it the retraction between the skirt and the print doesn’t work properly. Theres a bit of an exception for the first unretract, when moving from the skirt to the print, that unretract seems to happen at 30% speed. The example here is matches the settings in the first picture in this post, retraction of 1mm at 100mm/sec (these settings shouldn’t matter, as long as they’re non-zero and match the values in the replace command, the values you’ve configured in your firmware take effect when using G10/G11). If you just want to change your unretract speed to a different value from the retraction speed, you can place something like the following line in the script post processing section of Simplif圓D (Settings->Scripts->Post Processing->Additional terminal commands for post processing). Even if your printer’s firmware doesn’t support firmware retraction, you can still customize the unretraction speed. This post describes how to use it to tune retraction speeds or enable firmware retraction. Simplif圓D doesn’t provide native support firmware retraction (as of January 2016), but it does have the ability to do simple gcode post processing. Nozzle marring previous layers? try increasing z-hop, Getting post-retraction bumps? try slowing the unretract speed or tweaking the restart distance). (Too much stringing? try increasing retraction distance. Why use firmware retraction? It lets you set configure retract and unretract speeds separately, and values can be adjusted mid-print. ![]()
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