Ball-Pivot Roulette Wheel

A 150 mm tabletop roulette wheel that spins on a single 6 mm steel ball pivot, so it needs no skateboard bearing, no glue and no rubber band.

Date: 2026-11-12 Category: Puzzles and Games Modeling difficulty: Intermediate Estimated print: ~32 h total · ~395 g PLA (estimate) Suggested price: $35–$60 printed · $6 digital file (estimate) Status: Concept

Description

The wheel is a heavy 200 mm base with a sloped ball track and a 150 mm rotor with 37 pockets in the European 0–36 order. The rotor hangs from a 6 mm steel ball that sits in a small cup in the top of a centre post and in a matching cup in the roof of the rotor hub. A 12.8 mm bore around the 12 mm post stops the rotor from wandering sideways. The pivot sits near the rotor's centre of mass, so the wheel stays upright and spins for a long time from one flick.

The player launches an 8 mm steel ball around the sloped track, spins the rotor the other way, and the ball drops over a 1 mm lip into a pocket. The pocket numbers are engraved on the inner band of the rotor, 5 mm tall, and can be filled with paint or printed in a second colour. The remaining surfaces are plain, with three concentric grooves on the centre of the rotor.

Everything printed is two parts: the base with its post, and the rotor. The only hardware is two steel balls.

Why it sells

Roulette wheels are already a common print. MakerWorld 593046 is a two-part wheel with glued-on numbers, and a Printables copy exists at 481502. A customizable American/European wheel is at Printables 1127006 and another free wheel at Printables 1118878. So the demand is real, but a plain wheel is free everywhere. I found these through a WebSearch on 2026-11-12 and did not find sales figures for them.

The weak spot in the existing listings is the bearing. MakerWorld 1104691 is a remix that adds a 608 bearing seat to make the wheel spin properly, and MakerWorld 1310113 says it needs a skateboard bearing, a rubber band and some glue. One commenter on the first listing reports the ball is better printed at 100% infill for weight. This design replaces the bearing with a printed ball-pivot and uses a steel ball for the roulette ball, so a buyer only needs two loose steel balls and no glue.

Who buys it

Adults hosting a poker or casino night, and people who want a themed desk or bar-cart toy. The buyer is also the hobbyist who printed one of the free wheels, found it spun badly and wants a better one. Etsy, MakerWorld and local craft markets fit. A printed, assembled version with painted numbers is a gift item; the file suits MakerWorld and Printables.

Design overview

• One thing sets it apart: the rotor rests on a 6 mm steel ball in two printed cups, so the wheel spins freely without a bearing, glue or elastic.
• 37 pockets in European order (0, 32, 15, 19 … 3, 26) with the numbers engraved on the inner band so the ball never covers them.
• A 25° rising-outward ball track with a 9.5 mm outer wall, so the ball circles at least a few laps before dropping to the rotor.
• The pivot ball sits at z = 37, close to the rotor's centre of mass, which keeps the wheel from tipping when it spins.
• The pockets open outward and are separated by 1.6 mm deflector walls, so the ball hops between them before it settles.
• Rotor prints top face down, so the pocket walls and engraved numbers come out smooth and no supports are needed.

Dimensions

Parts list

Hardware and non-printed parts

• 6 mm steel ball (grade G25 or better) × 1: the pivot between the post and the rotor.
• 8 mm steel ball or glass marble × 1: the roulette ball.

No glue, screws or bearings.

Fits and tolerances

Modeling guide

Origin: centre of the base bottom face, +Z up, X and Y in the base plane. Both parts share one Z axis, so the rotor is modeled at its assembled height.

1. Base: draw the half profile on the XZ plane with the listed (r,z) points and revolve it 360° about Z.
2. Base: cut the 6 mm ball cup in the post with a sphere of radius 3.1 centred at z 37.1.
3. Base: fillet the track-to-wall corner at radius 3 and chamfer the bottom outer edge 1.
4. Rotor: extrude a Ø150 disc from z 32 to z 42.
5. Rotor: add a Ø20 hub tube from z 19 to z 32 and bore Ø12.8 from z 19 up to z 37.4.
6. Rotor: cut the upper cup, a sphere of radius 3.1 at (0,0,37), above z 37.4.
7. Rotor: cut 37 pockets between r 60 and r 75 to the floor at z 38, leaving 1.6 mm separator walls.
8. Rotor: engrave the numbers on the band at r 54 (5 mm tall, 0.6 deep) and cut three 0.8 mm ring grooves at r 20, 28 and 36.
9. Check: with a 6 mm ball in both cups the rotor bottom should sit 1 mm above the deck and the rotor top 0.5 mm below the track lip.

Print settings

Assembly

1. Drop the 6 mm ball into the cup on top of the post.
2. Lower the rotor over the post until its upper cup seats on the ball.
3. Give the rotor a flick; it should spin for 30 s or more. If it drags, check that the bore is clear and the ball is in both cups.
4. Drop the 8 mm ball on the track, spin the rotor the opposite way and launch the ball.

Variants and upsells

Sizes: scale the whole wheel to 120 mm or 180 mm. Rotor colourways: red/black pockets with a green zero, or a monochrome version. A 38-pocket American layout is a one-parameter change. Bundle: wheel plus a betting mat sold as a separate flat print or fabric. Next in the casino line: a card shoe and a hand-crank ball cage in the same colour set.

Selling and distribution

Sell the print on Etsy and at craft or gaming fairs, and the file on MakerWorld and Printables. Price the print from material (about 400 g PLA) plus roughly 32 h of printer time plus a margin; $35–$60 is an estimate. Because the free wheels are common, the file works as a paid upgrade for people who dislike the bearing. For the file, use a CC BY-NC licence for free sharing or a commercial licence at about $6. Keywords: roulette wheel, casino night decor, tabletop roulette, 3D printed roulette, game night gift, poker night, mini roulette, desk toy, spinning wheel, bar cart gift.

Risks and IP notes

• Roulette wheels are a crowded free category. Mitigation: sell on the bearing-free pivot, the weight and the finish, not on the wheel itself.
• A 6 mm ball pivot may have more friction than a bearing if the cups print rough. Mitigation: print the cups at 0.12 mm layers or lightly polish with a 6 mm ball and a dab of PTFE grease.
• Selling a real-money gambling product could be restricted on some marketplaces. Mitigation: list it as a toy and decor piece with play chips only.
• IP: no casino brand names or logos; list it as a generic European roulette wheel.
• The ball can fly off at high launch speed. Mitigation: the 9.5 mm outer wall; keep the 8 mm ball steel so it stays on the track.

Resource links

• Roulette Wheel (MakerWorld 593046) — Two-part wheel with glued-on numbers; commenters say the ball wants 100% infill for weight
• Roulette Wheel (Printables 481502) — Same design on Printables; first layer of the numbers printed white with a colour-change pause
• Roulette wheel with 608 bearing remix (MakerWorld 1104691) — Remix that adds a seat for a 608 bearing to make the wheel spin smoothly
• Roulette wheel needing a skateboard bearing (MakerWorld 1310113) — Listing says one rubber band, one skateboard bearing and a little glue are required
• EZ print customizable American/European roulette wheel (Printables 1127006) — Customizable wheel; shows both 37- and 38-pocket layouts are already shared
• Roulette wheel (Printables 1118878) — Another free wheel on Printables, evidence the category is crowded and free