Excluding some design time that I didn't track, I spent a month designing and stress testing a standing desk that would merge my new hobby of printing with another in place hobby of carpentry.
I started with a 63" X 31 1/2" (160cm X 80cm) Lagkapten desktop from Ikea and designed the mount around it's hole pattern. This one broke with middling force on 10" of leverage. I deemed it to be better than I actually expected, if not as good as I needed.
I decided to try more infill for the second test, imagining that a more dense part would be a better solution. It only marginally withstood my effort to break it.
A friend suggested that I add a fillet from the leg socket to the edge, and recess the screw holes. Being a stubborn man, I decided to try for middle ground. It still broke, but higher up on the socket.
The design I landed on, was a return to the previous design, with a thicker wall, the fillet to the screw holes, increased resolution (instead of printing layers at .24mm, i printed this at .12mm), and a return to 20% infill.
This ended up being the end design since the bracket withstood the torque and overcame the screws that held it to my work bench.
And here we are. Another two weeks of nearly constant printing for the brackets and feet, cut the legs and support beams, and assemble the finished product.
I do have another two desks to build. One of which is going to reuse the old desk top (a larger version of the one on the completed desk) which will become a work bench for the printer to get it off the floor.
I also have a revision in mind to stabilize the tables... photos and designs to follow in another post.
Lessons learned.
- Increasing the resolution and the wall count can have more effect than increasing the density of the infill.
- variations in construction won't necessarily have predictable effects on the finished product.