Here's a 3D-printed version of the classic impossible dovetail puzzle, inspired by a machined metal version by Chris at Youtube channel Clickspring.

After modeling the geometry in Onshape, I printed my version in Estonian blue, black, and white. I wanted to sign my name on the pin so I rebuilt that part in Solidworks, which still offers a less annoying way of importing 2D vector art for this sort of feature. If you'd like to make your own impossible dovetail or play with the CAD models, follow these links:

• Impossible dovetail, Onshape document
• Impossible dovetail pin, Solidworks file
• Impossible dovetail, STLs for 3D printing

I recently documented my designs for a kind of filament extender structure that I added to my 3D printer to keep the filament a bit more under control on its way from spool to extruder. Maybe it will be of use to someone else that has a Prusa i3 clone like mine.

In recent Christmases I've enjoyed making some gifts, decorations, and gift-wrapping components myself, often employing some of my desktop fabrication machines: the laser cutter, 3D printer, etc. To satisfy 2018's “Esto Blue and Lion Gold” theme I used that 3D printer to make some custom stamps featuring a lion face, suitable for use with blue or gold stamp pads.

The final design ended up very different!

After sketching a lion with a magnificent mane to serve as some kind of guide, I designed the final artwork in Adobe Illustrator, then imported that 2D vector drawing into CAD to extrude it into a 3D block. I've been trying to do my more hobby-oriented CAD work in Onshape so that it's easily accessible and modifiable by readers without a lot of resources. Generally I've been very pleased by how complete this product is, but vector import in Onshape is still a pain, so I did this one in SolidWorks instead.

Alton Brown's brought a lot to my life, including one of my favorite kitchen tools, the probe roasting thermometer. I use mine for everything: roasting meats, grilling, even baking salmon (absolutely foolproof, this). But it's brought one major annoyance to the kitchen too: that unruly tangle of probe and oven-proof braided wire left in your hand after cleaning up from the evening's roast. Now, in the list of things I should have done years ago I can finally include taming that snarl—with 3D printing, of course.

Here's a simple puck-shaped wire organizer I designed and printed in PLA plastic. Insert the probe end into its receptacle, secure the bend of the probe in its slot, then wrap the cable around the spool. Finally, plug the connector end into the top of the organizer to keep everything tidy.

I made this blinking-creature-eyes lamp as a small gift for my father, who loves to scare neigborhood children during Halloween with a heavily decorated entryway. It's suitable for hiding in foliage, under a chair or couch, in a darkened window, etc. You can make one easily if you have a laser cutter and some way of making printed circuit boards, although a cardboard box with cutout eyes and some LED strip would work just fine as a quick way to get started.

PCB design in Eagle

This design was heavily determined by parts I happened to have on hand. The LEDs are high-brightness red 5mm devices; I bought a whole sack of these once from Electronics Goldmine (they made an appeance in the Goldfinger laser among other projects). Although I could have controlled the blinking with a 555 timer or similar circuit, I had some surplus Arduino Trinkets from Adafruit, and programmability is nice to have in a project like this one.