Parametric multipart juggling club, fully customisable

Parametric multipart juggling club with wooden core, TPU bumpers and fully customisable shape. 
I designed this so I could print a juggling club that fits my backpack, but it can be used to make juggling clubs in all sizes and shapes.

Use OpenScad to adapt the design. Customizer panel can be used. Or print one of the included STLs. (I only tested the "fits backpack" one, that might also be a good "kids size" club).

Split the STL into objects in slicer and print each in a suitable filament:

Handle sleeve is printed in Nylon, but other "soft yet strong" filaments might work too. (TPU, TPE, Flex PLA, etc). Or wrap it with thick PE foil instead of printing this. PETG is too hard, XT copolyester is too hard and brittle. Handle can be printed in Vase Mode.

Top and knob are printed in TPU, as hollow as possible / as flexible as possible. So with low infill and maybe less (or no) perimeters.

Blue "bottle" is printed in nGen, but I think PETG or maybe PLA will work also. Or a stiff TPU/TPE. The transparant "bottle" was printed in XT copolyester - it cracked on first drop (is not impact resistant / too hard/brittle). The nGen bottles do crack eventualy, but much less easily (the TPU bumpers help a lot). Maybe PETG is better (Not tested yet), or thinner walls.

Middle ring was printed in PLA. It can be used to tune weight, as wooden dowels of the same length and diameter vary in density and weight. The part that is hidden can be made longer or shorter, and the infill can be varied.

The wooden core rod diameter can be changed. I used 18 mm. The mini uses 5 mm.

Assembly:

Besides the printed parts you'll need 2 screws and a wooden dowel / rod, from a hardware store.

1. Make the wooden dowel rod to length (OpenScad outputs this when you render the design, in the included STLs I've put it in the file name).

2. Pre-dril screw holes in the wooden dowel.Drill jig can be used as a helper when drilling with a powertool, but a gimlet (fretboor) might be even better.

3. Weight the wooden dowels and the printed parts. Sort them together such that total weight varies as less as possible. Perhaps print different middle rings to tune total weight.

4. Assembly is easy-est from the ground up, so by adding the bottom puck (top) to the bottle, then add the wooden dowel and fix it with a screw to the bottom. The middle bit ring can be used for centring or added later.

5. Glue the middle bit ring to the bottle with hotglue, and to the handle/sleeve too. This prevents rattling.

6. Affix the top knob to the tob with a screw. The screws hold the whole club together.

Newest version in git on https://github.com/Lukelectro/jongleerkegel

See also this (Dutch) blogpost: https://www.eluke.nl/2026/10/19/parametrische-jongleerkegel/