Clover Top

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Update

I've been experimenting with printing this top at smaller sizes and I've succeeded in printing it so it looks and spins well all the way down to 55%. To get the stem to print well that small, I made two significant changes: I created a new version of the STLs with thicker stems (labeled "55 percent" here) and I've added a line of GCODE that reduces the print head to 180C at layer height 10.50mm. This could cause problems for filaments that demand higher temperatures. That worked well, but the final trick that got the stem printing beautifully was to add a second instance of the top to the plate so each layer had a little time to cool before the next one printed. At 70%, the stem printed a little rough. If you have the same experience, you might try printing two of it at once as well.

I also experimented in PrusaSlicer with the Elephant Foot Adjustment in the Advanced tab. By reducing it from 0.2 mm to 0.05, the seam between the two laves mostly disappeared.

Summary

This top is more open than any of my other designs, so it creates looks really amazing as it spins. It doesn't spin quite as long as some of the others (because it weighs less), but it's really stable (because most of the weight it has is in that center ring).

I've included my STL files, PrusaSlicer 3MF files, and GCODE. The top is available as 1 piece and two. I recommend the 2 piece. It prints a lot smoother and takes less time (almost ½ the time of the 1 piece). They spin about the same. 

If you want to print the 1 piece top, I'd suggest doing it inverted with the provided support collar. It goes around the stem and keeps the top from wobbling while it prints. The collar breaks away easily once the print is done if you get it adjusted right for your printer. I tried this technique with another of my tops and it worked OK, but the final print quality was pretty rough on top and it didn't spin better. It also took a lot longer and required more filament. Still, if you want to print the top as one piece, I recommend using the stem and printing just the first 30mm (takes about 45 minutes). While the print is still on the plate, try moving the stem sideways to see if it has give. Then, remove it from the plate and the collar and see if it was too tight. Then, scale the collar up or down as needed (probably no more than 0.5 - 1%). 

This is a great design for 2 or 3 color filament, rainbow filament, or adding color changes by swapping filament.

Print Settings

If you don't use my 3MF file, I suggest you set perimeters to 11 (yes, really) and infill to 100%. The tops need the mass to spin well.

Also, print external perimeters first. I couldn't explain why, but they are a lot smoother if you print the outside first.

I added grid supports with an overhang angle of 50 degrees.

Filament

If anyone's curious, I used OVV3D Tri-Colors Red-Yellow-Blue PLA.