elisvent

Use Keynote with a custom canvas size. You can do literally anything in Keynote.

https://vimeo.com/100377108

To repost their comment:

“ In my work, there's constant discussion about which is the best and hottest new design tool to use. I’ve tried many of them, but in the end I still keep coming back to Keynote. It’s easy to learn and use, swapping assets is a breeze (using media placeholder), and most complex animations can be tested with Magic Move (the secret sauce to it all). Producing animations can span a range of fidelities; I can produce all the assets in Keynote, or I can copy out of Illustrator or drag and drop from Sketch (how seamless this works puts a smile on my face every time). As an interaction or visual designer, if you’re not using Keynote to test and bring your work to life, then I think you should start now! At least I hope this little experiment inspires you to try.”

If you're ok with a slightly rougher finish on the casting but the same material properties as Kee Klamp, you can get cheaper store-brand variants of many of the common connector types from Global Industrial, Grainger, and other industrial suppliers.

Also, structural pipe is usually pretty dirty from production and I've found it's worth the cost to just have a local metal fabricator take care of the cleaning.

https://www.globalindustrial.com/c/storage/fittings-framing-...