Marble Run — Print-in-Place Roman-Greek Track

A complete marble run that prints in one go and comes off the bed ready to play. The path snakes around a Roman-temple base — three classical columns hold the upper deck — with a Greek-key meander engraved around every outer wall.

Main run (~203 × 180 × 232 mm) : inlet at the upper deck, drop-curve to the middle plinko zone (3 inline center pins) and finishes in a 3-place podium chute. End slot accepts the finish-flag accessory; mini-poles already in the slab lock it laterally.

Start hopper accessory (separate piece): tall straight Ø9.5 mm silo loads single-file, sloped chute releases marbles one at a time into the inlet — solves the "lift the flag and all balls dump at once" issue. Two print pieces (silo + slide), no glue required, snap together.

Start + finish flags (two small standalone pieces): |---| plate with a finger bore. Drop into the run's existing flag slots; lift the flag to release. Print them in two filaments side-by-side for a black-and-white checker effect or paint them after print.

Sized for 8 mm marbles (channel 30 mm wide, walls 12 mm tall — fits 3 marbles abreast with side play).

Print: single colour, supports off (the Roman columns are the supports — all overhangs ≤45°). The main piece is dense in tris; allow ~10–14 h on 0.2 mm.

Source: OpenSCAD, fully parametric (channel width, wall height, plinko pin count, column flute count, meander unit cell, etc.) — fork freely.