Originally shared by Mark Wheadon
I’m prepared to bet you’ve not seen a GCODE preview look like this before.
#3DPrinting #VelocityPainting (I just made that up 
I like #VelocityPainting - very good name for the technique!
That’s an interesting thing to do. I’ve found only recently how little of a speed change can affect texture and translucency.
WOW! Please share what you can on the technique!
WOW
This is awesome. I’ve been following what you guys have been doing with velocity painting for the last week or so. Awesome Idea!
For those of you looking to replicate this, I think it can be done “somewhat” easily in Slic3r. Slic3r has the ability to add a modifier mesh (in the standalone program not if it is opened inside cura/repetier,etc). If you create a model with the outline of the design you want to appear on the outside of the vase, and uses it as a modifier mesh one of the many variables you can change is print speed. (i’m also wondering if simultaneously changing the perimeter width slightly would enhance the effect)
Here is a vary basic blog post on modifier meshes
http://slic3r.org/blog/modifier-meshes
The PITA part of this is right now you can’t re-position the modifier model in Slic3r. You have to model the 2nd mesh in CAD and position it where you want it and make sure it has the same origin point as the mesh you want to modify. That way it will line up correctly when you load it. The print speed changes wont be visible in the g-code preview, and it’s not going to be easy to use this technique on the awesome pictures and full model patterns patterns Mark has been doing, but in theory it should work for simple designs. It might give you guys something to experiment with until Mark releases his script. I’m going to try it out myself over the next day or so if i have time.
@Jason_D You could do some really nice patterns with modifier meshes I would think – just a bunch of different sized spheres dotted around would produce a funky pattern on the object being printed for example – very '60s. One caveat: I don’t believe you can use slic3r modifier meshes on prints sliced in spiral-vase mode. Some goes for multiple processes in Simplify3D – can’t be done for vase-mode prints.
I dont see why it wouldnt work in spiral vase mode, but havent tried it. If its a bug or limitation I wasnt aware of it. Could still try a single outerwall print normally I guess if it doesnt work, though the seam would be visable
Looks like you were right Mark. Getting an error when I try to generate g-code on a spiral vase with a modifier mesh. Seems to work on a regular single perimeter print, but can’t see any changes in the preview so I’m not sure if it is working. From looking at the g-code I’t might be making the speed changes but I’ll have to actually print one to tell for sure.
@Mark_Wheadon how the heck did you get the speed to change in such a pattern?
@Anthony_Djekic_twans I post-processed the GCODE using a perl script – basically substituting the ‘F’ parameter in the GCODE moves to change the speed.
Lots reasons why unable to reach to you sincerely sorry
I’ve released the code into the wild: https://plus.google.com/+MarkWheadon/posts/5PVTBnXKU2E
@Mark_Wheadon hi Mark, I’m trying to use your code but am getting nowhere (probably because I’m a complete noob at Perl). I’m getting a message that the Image::Magick is not found, but I can’t see how to install the package. Can you help?