Tag Archives: catapult

Hats Off To The Great Fredini

body scan in netfabb

This is the second in my series of Maker Faire Gems posts, where I’ll be post-blogging a bunch of fun stuff I found at World Maker Faire in NYC last week.

The Great Fredini is one of the 3d printing community’s more colorful members. He’s a natural showman and instant friend. He’s also responsible for the Coney Island Scan-A-Rama, where tourists can order 3d printed portraits for a modest fee. Fred does the printing in his studio.

All of Fred’s work is Open Source and freely available online, which means there’s nothing preventing you or anyone else from building your own Scan-A-Rama in Bemidgi, Capetown, or whichever far-flung locale from which you hail. He’s standing on the shoulders of giants and is well on the way to becoming a giant in his own right.

Fred did what looked like a nonstop demo of his Scan-O-Tron Saturday and Sunday at Maker Faire. Here’s how my scanning experience went.

The Scan

Fred says that hats and glasses are one of his personal scanning nightmares, so I had to doff mine for the scan. Permit me to talk about my hat for a moment. I really like my hat.

on platform

It’s a Filson Shelter Cloth Packer Hat. I’ve got three of these: one in Otter Green for late spring, summer, and fall, an insulated one in Filson’s Tin Cloth for winter (with earflaps, no less!), and one in white to be worn with a linen suit at semi-formal summer events, but never after Labor Day because even I know that basic fashion rule.

After years of wearing this style it’s become my Samson’s locks, Green Lantern power ring, and horcrux rolled into one. It’s been across the Atlantic twice, it’s been to Vegas, and if anyone ever needs to clone me all they have to do is take a scraping off the inside.


I wasn’t a hat guy until I started reading wilderness survival manuals and realized that having a hat is one of the most basic precautions one can take to keep oneself alive out there in the wild.

On the other hand, in a city this hat’s uncommon enough that it’s pretty easy to look like a dweeb while wearing it.

On the gripping hand, it makes a fine beacon. I’ve met dozens of people who know me as the hat guy before they’ve ever talked to me face to face. Chaperoning a field trip is easy because the kids can find me in a crowd quickly. New acquaintances have their memory jogged by a mention of the guy in the green hat.

(Unfortunately I won’t be able to wear my favorite Otter Green headwear in China, because 戴绿帽子 is why.)

I do get a lot of compliments on this hat from hunters and other outdoorsy types. I’m also frequently jumped by Ukrainian thong models. Apparently Oksana’s into dweebs.

Unfortunately the wide brim on the hat wouldn’t print even if it would scan, so bare-pated I stepped onto the plywood scanning platform.

The scan is fairly quick. Fred will ask you to take a pose without too many overhangs so that you’ll print properly without support. In my case this means arms akimbo, a bit of contraposto, and face angled skyward. One can’t help but tend towards majesty when being 3d scanned by The Great Fredini.

Here’s the view from the platform: on platform

Fred gives you warning that he’s about to release the brake on the platform, and then the platform gently rotates a couple of times while a hacked Kinect invisibly reads your form. A few revolutions later I stepped off the platform and the next next person after me was a drowsy infant. (I’d love to see how that scan turned out.)

I have no idea how much post-processing, if any, Fred has to do to make the model ready for printing, but the mesh was manifold and error-free when I first got a hold of it.

I’ve got a couple of printers here that can take a stab at printing a portrait, but before I do I’d like to get a look at the mesh. There are a couple of little problems like this occlusion error on the inside of my left arm, but nothing that’s going to make the print fail.

occlusion error

Onward, and hatward.

The Hat

If this is to be an accurate portrait, it’s got to have my headwear included. A 123DCatch scan of the hat was decent, and even picked up some of the stitching in the brim’s top surface. After a few minutes of cleanup I realized that although I might eventually edit my way to a printable scan, I might be reflecting poorly on Fred’s scanning process by adulterating it with other scanning technology. Better to let Fred’s scan stand on its own merits and add a modeled hat later on.

scanned hat

It’s a fairly simple model so I made a 3d facsimile in Maya using the 123DCatch scan for reference. I got close enough in 20 minutes to visually communicate Filson Packer Hat, especially at the size it’s going to be printed.

modeled hat

I could in theory just join the hat mesh to the body mesh, but the brim’s overhang is just way too big to print as a single piece. Better to print the hat flat on the build platform and glue it to the body.

I posed the hat at a jaunty angle and used it as a template for slicing off the top of my head. This will give me a nice flat surface to which I can attach the hat.

flat head

And then it’s just a simple matter of printing the hat and body separately and gluing them together post-print. Here’s my 3d portrait, printed at half Fred’s recommended size, standing with a Seej Penny Catapult.

Seej Starter Set, 2013 Edition

downloadThe original Seej Starter Set gets an upgrade to take advantage of the advances made in home 3D printing over the last twelve months. Other Seej models are available for free download in The Forge.

The dawn of the hobbyist resin printer is upon us, so the set includes a one-piece flag and a fancy voronoi bloxen you can use to show off your printer’s capabilities.

The proliferation of inexpensive filament printers with smaller build platforms requires the advent of a smaller Seej engine, so I’ve added the Marshmallow Mangonel to the kit.

The classic catapult gets improvements inspired by community feedback, too. It’s all compatible with older prints, and is much, much more accurate.

Seej is an Open Source tabletop wargame designed to advance the state of 3d printing through competition and player-directed evolution. Rules for Seej are at www.s33j.net.

#staytuned, I’m releasing a new player race next week.

#stayreallytuned, I’ll be releasing a new Seej Starter Set in 2014.

What a difference a year makes.

I’ve been printing with my Replicator1 for just about a year and a half now. Here’s what my Penny Catapult prints looked like when I started out. (This print’s a veteran of many Seej battles.)

And here’s what my prints look like after countless hours of learning and frustration and failure and learning.

That cross-grain seam in the catapult’s side arm is probably caused by two pieces of blue painters’ tape butting up against one another. I do all my PLA printing on painters’ tape whether I’m using my Rep1 or Printrbot Simple.

One major difference between these two prints is that the top is ABS and the bottom is PLA– after a year of working with both I’d have to say I definitely prefer PLA. It smells better and heats up more quickly, which saves precious minutes of printer warming when repeatedly iterating through a design.

You can get a mirror-finish base with ABS, but apart from that I can’t see a reason to bother with it. Most of my stuff doesn’t wind up in high-stress situations so the added strength isn’t much of a draw for me.

Filabot Recycled ABS: Penny Catapult


The spastic mob of nerfherders, scallywags, and ne’er-do-wells that follows this blog knows that I’ve been printing almost exclusively with Filabot‘s recycled ABS lately. I’ve got a pound of this stuff to get through for review purposes, so I’m cranking out fortifications and war machines day and night. It’s like the fires of Isengard over here.

I’ve always felt that the starter catapult included with the Seej Starter Set was a little anemic. The base of the throwing arm can get caught on the playing surface, and it arcs too far forward to get a good ballistic trajectory for the penny payload. This engine’s been around a while, and it’s due for an upgrade.

There are two additions to this catapult: the footings and the atlas. The footings are self-explanatory: print four of them and snap them onto the side braces to get the end of the throwing arm off your gaming table.

The atlas stops the throwing arm a little sooner than the crossbeam normally would, which gives you more range and power than a stock penny catapult.

These upgrades are backwards-compatible with existing penny catapults, so if you’ve been playing Seej at your makerspace this will only enhance your game. Remember that you probably won’t get a lot of torque with a single rubber band, so use two or three.

Flagrant stagecraft alert: I’m using a twist tie to hold the lever arm in place for the photo.

You can grab the catapult here and print it yourself. Have fun, and wear eye protection!