@cncmodeller
Thanks for the warm words.
The Slider is pretty small and I will mount a hotend with Bowden extruder at most. The hole pattern is 20x20mm.
But the concept is scalable. You can use bigger Delrin or PTFE rods to beef it up.
A few years back I tried to build a Delta printer with such sliders, not sure why I stopped.

Back to topic...
I designed a panorama frame and tried transparent PETG. It seems, Velocity painting doesn't like Arc Welder, or pressure advance, so I switched both off and got a pretty good result.

The frame is on thingiverse

honycomb_panorama_iso.jpg

@fma said in Texture mapping with feltpen carousel?:

I plan to make tests with pens, as Make Anything did; it is a very easy setup...

I already figured out, only 'permanent markers' stick to PLA.
I think, I've seen the video and their process is not able to produce real textures.
You'd have to dye the filament with a timed process. I'd better like to steal the mapping algorhythm from "velocity printing" and rewrite it to add ink layer by layer.
I don't expect perfect results, but a powder printer with inkjet is a bit above my budget..Let's see how bad it is..