3d clock drawing9/10/2023 The PlotClock design is ingenious, and the instructions on Thingiverse are pretty clear. Assembly: Servo horns, glued and screwed to plotclock arms. I couldn’t find model of dry-erase pen that Joo used anywhere in the United States, so I printed the cap from the file provided, and ordered a few different models of dry-erase pens online, hoping that one would work. The original design used the pen’s own cap with a small piece of cloth attached by double-sided tape for erasing. In addition to the laser-cut parts, there are instructions for 3D printing a holder/sweeper for the pen. The hardest part was waiting for the package to arrive. The upload and ordering process was very easy. I then saved it as a SVG (scalable vector graphics) file. Before uploading it, I imported the PDF design file into Inkscape (a free CAD program) to modify the line thickness and color to fit the guidelines for Ponoko uploads. I uploaded the design to Ponoko, an online on-demand manufacturing service, to be laser-cut from 3mm clear acrylic and shipped to me. There is also a 3D printable version of the plans. Joo provided PDF plans for laser-cut parts along with a 3D Google Sketchup file of the assembled machine. The Plans: Opening and editing the PlotClock PDF in Inkscape allowed it to be saved as an SVG file for upload to Ponoko. After locating the plans and instructions by joo at Thingiverse, I absolutely had to make one. There is something very human and endearing about the motion of the arms as they perform their task of drawing and erasing over and over and over again. I found a YouTube video of a clock that can draw the time with an erasable pen, then wipe it away before restarting the cycle:
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