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Well, black Friday isn't a European concept (I never understood why a lot of people on the interwebs got so excited around this time) . I don't think we did any such sale last year, but that won't mean that it will be the same for this year.
I'm guessing it's a set of pixels that are either on or off (I didn't make it, so I'm not 100% sure). The logo doesn't have a font in the machine, so this is the only way to do it.
Or even better; Modify the head so you can bump the object off the plate. Especially with a heated bed this should be possible. Just cool down the bed, and smash the head into the object to push it out of the printer.
This is also why 'solid modelling' is much more suited for 3D printing, as in that case you are very explicit in what is inside and what is outside. Voxel based modeling is a good example of this, as voxels are essentialy 3D pixels.
Could happen, i'm not quite sure how most browser do the caching. I think in our case the company network does some caching aswell. This is why you test sites with ctrl+f5 for refresh, as that force reloads a page.
If i recall correctly the UM2 should have protections in place for moving the motors by hand. The UMO not so much.
I havent read all replies, but you might want to try and loosen the feeder screw a bit. Having it too tight can cause grinding.