FLIP-60 three-reel jackpot edition · build manual

Lucky Lever Jackpot

Three reels, one lever. Every pull clicks all three reels round together, and each reel carries the same 20 pixel symbols in its own order, so the line changes every time: near misses, three cherries, three bells and one 7 7 7 jackpot in every 20 pulls. The gold knob rocks the star. Every part is printed: no screws, glue, wires, batteries or coins.

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Reference

The 20 pulls

The lines the three reels show, pull by pull, starting from how they're assembled. The reels always turn together, so this list repeats every 20 pulls. Tap a line to pull the machine round to it.

Reference

How it works

Everything moves by hand. Two small mechanisms do the work, and both are printed.

Lever to reels ratchet

The lever's hex peg goes through the cabinet's right side, across the side bay and into the axle. The axle runs through the divider wall, with its tip in the spool. A 20-tooth ratchet wheel on the axle passes a flexing pawl in the bracket: it clicks once per symbol as the lever comes forward and stops the spool going backwards. All three reels sit on that one spool, between spool A, two middle discs and spool B, so one click flips all three at once. Only the order of the symbols differs from reel to reel.

20 teeth3 reels, one spoolpull forward and down

Knob to star Scotch yoke

The knob sits on a printed shaft that ends in an off-centre disc just under the roof. The star's shaft comes down through the cap and ends in a fork that straddles that disc. As the knob turns, the disc's centre moves side to side and the fork follows it, so the star rocks one way, back, the other way and back on every turn.

3.5 mm off-centre±24° swingturns either way
Reference

What you need

Tick things off as you gather them. The ticks are saved in this browser only.

No screws, glue, wires, batteries or coins. Everything presses, clicks or slides together, so the machine comes apart again the same way.

Reference

Fits and clearances

Measured on the 3D model with the knob turned all the way round (every 15°), the lever all the way round and the chassis sliding in: nothing collides. Parts that aren't meant to touch are at least 1.2 mm apart. Parts that turn, slide or press together use the fits in the second table.

Reference

Not tested yet

The model says these work, but none has been printed. If one is off, say what and by how much, and the part gets adjusted.

  • How the pawl clicks and how strong it is (a 1.0 mm PLA flexure) with three reels of flaps on it, and how the lever feels.
  • The two middle discs on spool A's tube: the same light press as spool B, and both reels' tabs meeting in their holes.
  • Spool A's 138 mm tube printing straight, standing up with a brim.
  • The bracket's pegs in the divider's holes. If they're loose or crack, two M3 × 8 screws in the same holes replace them.
  • The axle's tip in the spool, and the lever's hex in the axle.
  • The gold knob on the printed shaft's D tip, and the cap's crush ribs in the roof window.
  • The two tall, thin shafts printing cleanly (53 and 49 mm, standing).
  • New on this cabinet: the 189 mm wide face printing flat, the gold dividers between the reels, the coin tray's scooped floor (a 3 mm bridge at its bottom) and the thinner 5 mm front.