Simple equipment like this tube holder are also very helpful and often unnecessarily add to the initial investment cost when bought from conventional vendors. Many of these helpers can be manufactured on a laser cutter in FabLab in no time.
Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.
1. Download the files
2. Use 3mm plywood for laser cut
3. Assemble it. And share a photo.