![]() The 24V Mk3 heats up fairly quickly, but 12V systems will be slower. ![]() There are plenty of things to do in start gcode that don't require extruding filament. On other printers, I will do something like: M104 S set extruder final temp Otherwise, you have to move the nozzle away while the nozzle temp changes to avoid melting part of the print.įor startup gcode, there's no reason to do it if you're not putting anything in between, yet there's no reason not to have both in case you later want to stick something in there. For a temp tower, the amount of time to increase/decrease temps to the next increment are minimal and will usually happen within one layer, so it works well for temp towers. You just minimize the amount of time it takes to get to the final M109 temp. It's so you can do a few more things that aren't temperature-dependent. Its more code, but perhaps a better way for 10 degrees ore more is to hard code M109 at only the layers where you change temp and also add a z-hop/retraction to avoid an artifact at the pause point. For 5 degrees or less, M104 is fast enough where it won't matter. The firmware is slow and can pause unnecessarily long with M109 even when the temperature is already at the target - this could introduce artifacts at the pause point. M109 would work too, but keep in mind this g-code statement gets executed at every layer change - even on layers where the temperature won't actually change. Is a 10 degree change quick enough that it doesn't make a difference? Or, are their other subtleties to M109 that I'm not seeing? M109 will set the nozzle temp and then wait for that temp to be achieved before moving on to the next gcode statement. Thus, you're printing without the temperature actually being at the target temperature. Posted by: curious why you (and everyone else, it seems) choose to use M104 to change temperature instead of M109.Īs I understand it, M104 will set the nozzle temp and then go on to the next gcode statement.
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