Category Archives: Special Projects

A 31-hour 3D printer print – the Roman Surface

Another marathon mathematical object run for the 3D printer – this time the Roman Surface (seen here in front of a Klein Bottle).

I had generated this surface years ago using Mathematica and had spun the object around in 3D, but still couldn’t quite assemble the thing in my head.  Now I can hold it in my hand I can see it clearly.

The 3D printer has been taking such a hammering with these extremely long prints that the X Y bearings are now sounding a bit klunky.  New bearings are on order.

The Anet A6 Does the Klein Bottle

After printing out the Sierpinski Triangle I thought I would go for a LOOOONG print.

So I went for a Klein Bottle (see Cliff Stoll’s You Tube presentations on the Klein Bottle – they are excellent) and a BIG one.  The Klein Bottle I printed out ended up 8″ tall and 4″ across the base.  This was printed at 0.2mm resolution and the print time was 18 hours!

Clearly it was a mistake not to use transparent filament for this object (or indeed for ANY 3D mathematical object) but that has been rectified by me ordering “natural” and trans-blue filament from Rigid.Ink.

In the meantime I thought it might be interesting to illuminate the Klein Bottle to see if it revealed the internal structure.  It didn’t – BUT – it did show up very nicely the printer’s print pattern in the wall of the bottle.  This is in fact the strengthening framework that lies between the inner and outer walls of the bottle (the walls are not solid).

The clear filament arrives on Monday – I will then need to give this one another shot.

Sierpinski sponge on the Anet A6 3D printer

I bought and recently assembled an Anet A6 3D printer.  Highly impressed by what you get for the money.  Been running calibration prints and test runs for a couple of days before doing my first serious 3D print.

I bought this printer with one aim only – to print out 3D mathematical objects.  I have printed out a couple of very small Menger sponges, and then I printed out this larger (3″ on a side) Sierpinski sponge.  Took around 9 hours to print this out at 0.1mm resolution.  It looks way better to the eye than it does to the camera.  I took the picture with it still attached to the Anet A6 bed as I might well destroy the thing in trying to get it off (it sticks rather well to the BuildTak).

Next print will either be a Klein bottle or a large (4″ on a side) Menger sponge.

My first Prime Number

So the Prime Number the MegaNode computing facility just found has now been confirmed – it is:


Which is 388,342 digits long and is in the top 5,000 largest primes.

I just ran the numbers through Mathematica to see what the whole thing looks like – it takes up many pages – and the last digit is a 9.