folding ruler 1m print in place hinges

A folding ruler 1m (kids edition) to measure furniture, rooms or makes.

This model provides print in place hinges which are pretty durable. There are 6x2mm magnet insets for stability and snap into position. They all should be aligned in the same orientation. I used water pump pliers to push the magnets into the insets. Without the magnets the hinges will become floppy with some usage.
I added small holes opposite to the insets so the magnets can be easily removed by pushing them out of the insets with something like a strong needle or a paper clip.

I designed it to be printed on FDM printers with 0.4mm nozzle. If anyone needs a model with thinner mm marks just leave a comment.

My test prints where on prusa mk4 mmu3 with prusament PLA galaxy black. 

I printed with automatic painted supports and with 0.2 layer height speed profile and a 0.4mm obsidian nozzle.

Grades and precision

I had to compensate for PLA shrinkage by 0.2% otherwise the ruler was off by 2mm at the 1m mark. I set this in prusaslicer for xy.

The e0 element of the 1m version should be 120.0mm and fits in my caliper for measuring and  calculating the shrinkage, without printing the full folding ruler.

If I understand the EG-Guideline 2004/22/EG (Wikipedia Gliedermaßstab) correctly my print achieved grade III, though I don't have another measure method than another folding ruler.

Similar

• 2m version with print in place hinges 
• 2m version with magnetic hinges