Big Macks 3D

About us

It’s only free if it fits.

There is a disclaimer that nobody puts in a listing for a free model. It’s only free if it fits. The thing is, that item on the internet was designed on somebody else’s bench, for somebody else’s drawer, sliced for somebody else’s printer. You find out after eleven hours of printing that it won’t work for you and you’ve wasted ten bucks worth of filament.

After running into that frustration a few times, I came across a parametric Gridfinity generator site. Suddenly, a few things went click. That day, I got to work developing parametric models of my own. It started with a simple laptop stand and went from there.

I’m a former CTO and have been developing websites since 1993. Between discovering this obsessive hobby and that experience, it made sense to create a site for the models I was coming up with.

That’s the whole concept for the company. We don’t sell you an STL and wish you luck. You tell us the size and the printer; we run the model and cut the parts to your build plate, split where they need splitting, with the assembly guide generated from the same numbers. It is made when you order it because it cannot be made before — nobody knows your setup but you.

We test-print everything we sell, on our own machines, in the sizes people actually order. Some designs never make it out of the printer room. The ones that do are here.

— Big Mack

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.