Big Macks 3D

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Parametric Filament Spool

Parametric Filament Spool

A sturdy screw-together spool for re-winding filament — free, in three sizes.

FREE

A reusable screw-together spool for re-winding filament off a cracked cardboard reel, a vacuum-bagged refill, or a loose coil. Two halves thread shut over the wound filament, and the 55 mm hub bore fits standard holders and enclosed multi-material units. Free, in 250 g, 1 kg and 2 kg sizes.

Configure & buy

Cardboard sags, cracks, and sheds dust into your feed path; refills and sample coils arrive with no spool at all. Print a rigid one instead — wind onto the hub, screw the two halves shut over the coil, and it drops onto any holder you own.

A single 55 mm bore serves all three sizes, so a 250 g sample and a 2 kg reel run on the same rod. Both halves print flange-down, unsupported. Free.

Highlights

Three sizes

250 g, 1 kg and 2 kg — all sharing one 55 mm hub bore, so any of them runs on the same holder.

Screw-together

Wind the filament round the hub, then thread the two halves shut over it — no glue, no tape, nothing to lose.

Rescue a ruined reel

Move filament off a cracked cardboard spool, a loose coil or a sample onto a spool that lasts.

Support-free

Both halves print flat on the bed, flange down, with no supports.

Free

Configure, preview in 3D, and download at no cost.

Configure & buy

In your download

  • Print-ready 3MF platesEvery part laid out on plates packed to your printer's bed and sorted by filament color — open in your slicer and go.
  • Every STLThe individual part meshes as well, if you'd rather arrange the plates yourself.
  • A parts listA manifest of every part and how many of each, so you know exactly what you're printing.
  • An assembled 3D model in your colorsThe whole thing built and colored the way you configured it — your reference while you print and put it together.

Configure your spool

Colors
PrimarySecondaryTertiary

We'd love it if you could help get the Big Mack's word out! The logo sits on both flanges. Embossed cuts the mark into them — one filament, prints on any printer. 3-color prints it in our red, white and black as part of the flanges — it needs a multi-material printer.

Two halves that screw together over the wound filament. The 55 mm hub bore is the same on every size, so it runs on a standard rod, roller or enclosed feed bay. Both halves print flat, flange down, with no supports.

Price: FREE (one licensed file — $1.00 off for carrying our logo)

Click “Update 3D preview” to render your configuration in 3D.

Add your printer

We size every model to your printer, so we need to know how big it can print. It’ll be saved for the next person with the same machine.

These are the printable sizes — the biggest part your printer can actually make, the numbers your slicer shows as the build volume. Not the bed or the removable plate, which are usually a little bigger.

Optional — build plate and printer-stand measurements

The build plate is the removable sheet you pop prints off; it’s usually a little bigger than the printable area. A plate rack is cut to the sheet, not the bed.

A printer stand is built around your printer’s feet. Give us all four and we can build you one — or skip them and add them later. Measure the BASE — the slab it stands on — not the machine’s widest point. Gantry legs, Z columns and X arms usually overhang the base and hold up nothing.

Where to measure your printer's feet Looking down on the printer's base with the front at the bottom. A is the full width of the base across the front. B is the diameter of one foot. C is from the base's front edge back to the center of the front foot. D is from the base's side edge in to that same center. FRONT rear feet — not needed A D C B
Looking down on the base, front at the bottom.

Choose your colors

Every model on the site opens in these three. Primary is the largest surface, secondary the part that contrasts with it, and tertiary the accent — feet, trim, the parts that tie it together.