Normal Distribution with Halfway Markers

thingiverse

This is the normal distribution, built with three channeled lines; one to mark the mean, and two to mark what is approximately halfway out on it. This does not mean that 50% of the data would fall between these two lines; actually, about 86% would. This is meant to work as a physical model for helping the visually impaired understand common statistical problems, such as any question that asks for what percentage falls between two given z scores. The ability to physically feel the lines gives a better understanding of what the question is asking, even if the lines are not in accurate places. Printed on a Lulzbot TAZ 5 with Bed Temp at 110 C and Extruder at 240 C, using Quick Print settings. Printer Brand: LulzBot Printer: TAZ 5 Rafts: Doesn't Matter Supports: No Resolution: Unsure Infill: 20% Notes: In Cura, I selected the standard brim from the simple printing menu and it worked fine with printing this model laying down. Post-Printing: Remove Brim I didn't get a picture because this was the first time I'd printed with brim and was excited to be able to peel it off. But when printed with a brim, there is a bit of brim that will be left over on the channels through the underside of the model. I used forceps (tweezers) to peel this brim away. How I Designed This: All Steps Remixed ayoung's "Normal distribution sliced to show '68-95-99.7 Rule'" model by removing the numbers and splitting the pieces before sticking them all together. I then took this piece and used it to cut out a section from a roughly circumscribed rectangular prism. I then used this cut out on another rectangular prism of the same size to get back to a now much smoother curve piece. Then, I made a small rectangular prism with dimensions that I forget, copied it six times, then used it to slice the channels in the model for the markers (cut one body using another).