The stroboscopic patterns are designed in MATLAB and drawn by EggBot Pro on colored glass Christmas ornaments. Motion of the balls is controlled by custom mechanism built using components from two Prusa i3 MK3 3D printers, like six stepper motors and two Rambo boards. On top of designing the patterns, which is Jiri’s hobby (when he is not busy with research) and building the whole contraption in a very short time, the team had to deal with issues including non-spherical ornaments, or how to use Rambo board to precisely control the velocity profiles.
We love to see how people make things, and Jiri did not disappoint, sharing process photos of making the rotation mechanisms.
With great help from his colleagues Martin, Krištof, and Filip they took Christmas ornaments to the next level and taught them to dance!
The final setup shot captures how they created such a beautiful video.
Merry Christmas to Jiri and the Advanced Algorithms for Control and Communications group! Thank you for sharing your project!
Bigger!!! I extended the extension—now it’s a double pantograph!! The #axidraw #plotter draws ~8.5×12” out of the box. My pantograph increases that to 45×58”. The precision has gone hell and there’s some warping—
Joanie LeMercier has been working on a project using invisible ink and different lighting schemes with the AxiDraw. He has posted a bunch of clips and pictures in his twitter stream with the heading “Invisible drawing.”
It is lemon season here yet again! Given the quantity of fruit my Meyer lemon tree produces, I have many opportunities to remake my marmalade recipes with little adjustments and changes. This time, I added ginger. Quite a bit of ginger. This jam has a bright cheerful flavor with a bit of zing to it which is perfect for the rainy weather we’ve been having.
8 cups (Meyer) lemon pieces
1 cup lemon juice
1 cup water
3 Tbsp grated ginger
2/3 cup ginger matchsticks
6 cups sugar
First cut up the lemons into small pieces and remove any obvious seeds. After juicing lemons, we’ve found that straining it through a julep strainer holds back the seeds but allows most of the pulp through.
Our favorite tool for grating ginger is a fine microplane. For making matchsticks, a mandoline slicer makes short work of it.
Put the lemon pieces, lemon juice, water, grated ginger, and ginger matchsticks in a pot and simmer until the lemons start to soften. Add the sugar. Stir regularly and cook to the desired consistency. To test consistency, put a spoonful on a plate in the fridge. If it’s too runny after cooling for a few minutes, keep simmering and test again after a few minutes.
Makes about four pints. If you want to can it for longer storage, Ball has a nice introduction to canning on their website.