Archive for the ‘ CG ’ Category

New 3D Print: The Fisherman

I work with many talented people, one of whom is Franco DeRosa, an amazing zBrush / 3d artist.  I’ve printed items for him in the past (here, here), and the latest is what he calls “The Fisherman” :

fishermanTopBrickFront_fancy

Here are the stats for the final (largest) print:

  • Printed on Makerbot Replicator (1)
  • Gray PLA on unheated removable glass built plate covered in blue painters tape with raft & supports.
  • Total print time: 29 hours, 52 minutes.
  • 2 shells, 5% infill, 100 micron.
  • 217g gross: 180g for the print, 37g for support.

It filled the build volume laying on it’s back, facing up:  This pushed all the support material to the rear, leaving the facial features really clean.

But before I got there, I printed two smaller versions:  The medium version was printed straight up, filling the height of the printer (so had more support scaring on the face).  The smallest one was the first printed, took about an hour and a half (low-res setting).  I printed all of these (2 large versions, one med, one small) front to back: probably 75 hours of straight printing with no problems.  Perfect.

 

New 3D print: Hanger Divider

The Mrs. & I were at a “container store” looking for home goods. Saw a 4-pack of hanger dividers for $12. That seemed like a crazy price to pay, so I decided to make my own.
Modeled in Autodesk Fusion 360. The hook has an ID of 40mm, which fits smaller metal, and larger wooden rods. Based on my print settings, it weighs 26g (and takes about an hour to print on my Makerbot Replicator 1), so based on the price I paid for filament, it works out to about a buck each.

Head over to Thingiverse to download the files for print and get more info.

Small-scale 3D print tolerances

I picked up some small but powerful cylindrical magnets, 8mm diameter by 3mm tall, to incorporate into a new multi-part 3d print:  They’ll help hold the whole thing together.  I print mainly in PLA, and while it shrinks less than ABS, it still shrinks, so I needed to make sure that the cylindrical holes I design in my 3d model will actually allow the magnets to fit, based on how my Makerbot Replicator (1) prints things.

Using my micrometer, I checked the size of the magnets:  They were within a few hundredths of a mm of their spec:  Negligible change.

I designed & printed a simple rectangular volume to place my test holes:  It measured 60x30x3 mm.  In it I placed three different holes with diameters of 7.5, 8.0, and 8.5 mm.  For the record its print specs are:  300 micron layer resolution, 2 shells, 10% infill, blue PLA extruded @ 220 deg, HBP off, on blue painters tape.  My print nozzle is .4mm.  Took about 12 minutes, and was firmly affixed to the build platform before removal with no curling.

You can see the results below:

cylTolTest01

So what were the results?  Checking with my micrometer….

  • The outer dimensions of the printed rectangular volume were very close to the 3d model:  .1 mm larger (or less) on X, Y, & Z.
  • The printed cylindrical holes were each nearly exactly .5mm smaller from the 3d model:  As you can see from the above image, the modeled 7.5mm hole ended up being printed @ 7.0 mm, the 8.0 hole @ 7.5mm, and the 8.5mm hole @ 8.0 mm.
  • Because of this, the 8mm wide magnet fits snugly into the 8.5mm modeled hole, which ended up printing with a 8.0mm diameter.
  • Another interesting side effect:  Even though the rectangular volume and magnet were both 3mm high, and the magnet fit in the whole snugly but easily, I was unable to push it all the way through without some force:  I believe this is because the first few layers probably ‘squish out’ more on the build platform, causing a slight lip to form on the bottom edge.  Nothing a drill or file (or obsessive-compulsive magnet pushing) couldn’t fix though.

So this raises the question:  Why does the outer-volume of the rectangle match the 3d model within .1 mm larger, but the interior cylinders are all .5 mm smaller?

New 3D Print: Dodecahedron

Dodecahedron, created from 12 separate pentagon volumes. Each pentagonal face is circumscribed by a 10cm circle.
I’ve liked the concept of creating many small repetitious things that assemble into something larger: This is my first attempt at that. Modeled in Autodesk Fusion 360.

Printed on my Makerbot Replicator (1).

Get print info and downloadable files over on Thingiverse.

HexTrivet

Based on my previous post of comparing different 3d apps for 3d printing, I thought I’d give Autodesk Fusion 360 a shot at making a simple hexagonal “trivet”:  My goal is to try to eventually cast this in aluminum, to see how well the small structures work.  But in the mean-time, things I learned:

  • How to create exacting-sized objects in the software:  It’s 100mm wide, and 5mm tall.
  • How to create my name & author year, and boolean that into the base of the solid.

Each trivet takes about an hour to print on my Makerbot Replicator (1), at 200 micron, with 2 shells, and 10% infill, using light blue PLA.  Took maybe… 20 minutes model?

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