Giant Dry-Erase Marker Chalk Holder!

I am making this instructable very rapidly because it is for the Big and Small contest, and I put a lot of time into the model, and went on vacation for a few days only to realize I had 1 day to finish my entry until I couldn't submit it, so I am typing this at the speed of light. I may fix all this stuff to make it more professional later, but I can't do that now because of the little time I have. This is a Giant EXPO dry erase marker, like the ones at school, and I always liked the idea of a giant tool that is usually small. I first just started modeling it up for fun but I decided to make it into a sidewalk-chalk Holder to make it look like you're marking up the ground. Its a fun idea and I wanted to bring it to life, so when I saw that nobody had done it before, I knew I had to make one for myself.

You will need a 3d print with a build limit of 250mm or larger.

This is because this model is designed for 1 inch wide and 4 inch tall cylindrical chalk sticks.

If you want to scale it to fit a different size, just reset the scale of the whole model:

(Diameter of your chalk in inches × 100) <-- this is due to requiring a 1 inch diameter chalk stick

I sadly don't have enough white filament to print the full thing, so I will attach a photo later.

THE ATTACHED MODEL IS A 3MF FILE FOR BAMBU 3D PRINTERS. RAW MODEL FILES ARE BELOW.

Attached are the 4 parts to the model. Each file corresponds to the model shown in the image. The second part of each file name is displayed in the image, which consists of a section view through the middle of the model. this makes its design easier to understand, and helps to make assembling the model a breeze.

Okay, so why is it colored black in the image?

The black is a placeholder color, as the sidewalk may be light colored, most driveways are black, and black on black does not work, so whatever color of chalk you mainly want to color with, or whichever one is your favorite, just change the black to that color. I believe that blue and red may work best, as they show up well on driveways, as well as being colors just as well known as black for traditional EXPO markers, but any color works.

I DO NOT RECOMMEND USING WHITE AS THE EXPO MARKER COLOR, AS IT WILL LOOK UGLY ON THE WHOLE MODEL. I suggest using vibrant colors that work on both white and black pavement, and work well as a dry-erase marker.

I don't really need to say this, but this is not a stolen model. This is entirely by me. The marker this design is referencing is the EXPO dry erase marker, from EXPO. This is not a real EXPO marker, and any chalk you may use shouldn't be used on a white board. Thank you for reading my instructable, and please consider making your own.

I'm sure I don't need to do this but I already have it written so...

Copyright:

THIS MODEL WORKS WITH CYLINDRICAL CHALK. I DO NOT CONDONE THE MODIFICATION OF CHALK TO FIT THE DESIGN FEATURE OF THIS MODEL. THIS MODEL IS OWNED BY ME, AND CANNOT BE POSTED BY ANYONE BUT ME UNLESS I GIVE PERMISSION, YOUR MODEL IS MODIFIED ENOUGH TO BE DIFFERENCIATABLE FROM THE ORIGINAL, AND MUST CONTAIN CREDIT TO ME AND MY MODEL.

MY MODEL IS NOT FOR COMMERSIAL USE UNLESS PERMISSION FROM ME AND THE INSTRUCTABLES TEAM IS GIVEN. More information about creator copyright laws is listed in instructables info and terms.

Thank you for your understanding.

Have fun!

The attached image shows a design feature similar to how an EXPO marker works, but while an EXPO marker uses friction and grooves to fit the cap, mine only uses one small groove. the groove, as stated in the image, doubles as the way to remove a stuck chalk piece from inside the tip. A narrow beam, such as a paperclip, allen wrench, or flathead screwdriver works to push the chalk out enough to pull it out. you can insert other block into the inside to help extend the lifespan of the chalk inside, but you can risk permanent loss of chalk due to the slit becoming blocked.

I am taking this waaaaaay too seriously 😅

you get the idea. slit is chalk loss prevention, and parts screw together. colors are always customizable, and a 250mm high print plate is recommended. Consider giving this fun toy a try.