3D Printed Star Design

I created this star design because I thought that my backpack was a bit bland, and could use some keychains. I mostly based this on my school's logo. Below is the STL file if you wish to print it out for yourself.

Supplies:

A computer (to use Onshape)

Onshape (application to create the design)

A 3D printer

PLA filament (for the printer)

A flash drive

Now, to start, I created a new Onshape document and made a sketch on the front plane.

I created a circle 3 inches in diameter and created two inner circles using the offset tool. One circle was offset by 0.1 inches, and the other circle was offset by 0.25 inches.

I then created two straight vertical and horizontal construction lines that cut the circles up into quarters. Using these, I created one line tilted 45° that cut the circle in half.

Using this tilted line, I deleted the top half of the smaller inner circle and the bottom half of the larger inner circle.

I then used the extrude tool on the outlines, extruding them by 0.25 inches forward.

I made a new sketch on the front face of the base and started with two horizontal and vertical construction lines with their midpoints on the origin. On the top right quadrant, I created a line 0.045 inches long that was slanted towards the right, and used the mirror tool to replicate this line but in the opposite direction. I made them have an angle of 36°.

I then used the circular pattern tool to create a star, replicating these two lines 5 times. I hollowed it out for convenience.

I copied and pasted the star up to the top of the base, upscaling it by 1.27. I selected this star and used the circular pattern tool, copying the star 28 times. From there, I copied and pasted the entire thing to rotate it by 8°. I was then able to delete every other star that was not on the thick part of the base.

With the stars on the thick part of the base (13 in total), I used the extrude tool and removed the stars from the base to make star-shaped holes.

I created a new sketch on the front plane and used one of the small stars from the previous step. I aligned it to be straight and upscaled it by 35. I then placed it into the position you see in the photos. I also created sketches of the circles that make up the base, which happen to be 3 inches in diameter, 2.8 inches in diameter, and 2.5 inches in diameter.

Using the circle sketches, I used the trim tool to delete any part of the star that went on the base, or beyond the base.

I then used the extrude tool to extrude the star forward by 0.25 inches, and the shell tool on the front face with a shell thickness of 0.15 inches.

I do not have any measurements for this portion; I based this portion on my school's logo. I made these lines on the front plane with a combination of 3-point arcs, lines, and sketch fillets to round out sharp edges. I then extruded them 0.125 inches forward.

I exported the design into a STL file, put it on a flash drive, and insert it into a 3D printer to start printing it out.

I think it came out pretty well!