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my immediate thought returned to the control tower file some of us have
Just finished the control tower...not sure if my painting skills are up to creating "Happy"...and the firmware in my printer won't allow me to do filament changes mid-print...yet :rolleyes:

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Great job on the tower!

For some printers, you may need to trigger a pause (M601, I think) and then manually change the filament, but I guarantee it can be done. You don't need a fancy machine like mine to do it, as this technique has been used for years with much simpler printers.
I'm using an Ender 3 V2, and 95% of the time the Prusa Slicer, Prusa lets me do the colour change, but the printer doesn't recognise the commands...I have tried to pause a print in the past, but from what I can remember it didn't end well...maybe I'll revisit that avenue. A friend has just redone the firmware on his Ender 7 and can change colours at will, hence my thinking along those lines.
 

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heck, there's probably 100 videos on YouTube about it, specifically for Ender 3 printers. ;-)
Funny you should mention YT, just been there and had a look...apparently the Cura slicer will do a filiment change, so I've just created a GCODE file in Cura, I'll run tomorrow to see if it works or not ;)
 
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I run an Ender 3v2. I never had luck with filament changes until I switched to Jyers firmware, which was simple, and offers a handful of nice improvements.
Watched a YT vid on the Jyers FW earlier today and it's on my list of things to do tomorrow ;)

 
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Watched a YT vid on the Jyers FW earlier today and it's on my list of things to do tomorrow
Finally got round to doing this yesterday (been printing Greg's flat kerbs for days now)...it was very easy to install, and I can now do filament changes mid print (y)

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That looks great! Did you use an ironing feature? It looks as if the ironing was not applied to that area, which I've seen from time to time using PrusaSlicer.
No I didn't...something went screwy just after the second colour change...but no big deal, this is his new abode...

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Going slightly off thread...I decided this morning to set myself the task of converting a jpeg into an actual object, okay for a first attempt, but I need a fair bit of practice yet, I also need a better program to turn an jpeg into an svg, the one I used (I tried three free versions off the web) left out quite a lot of detail, and the other two failed

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