Portable Sun Dial

Based on a description in an old (1984) education magazine I build a virtual replica of a portable sun dial which was inspired by medieval portable sundial from Canterbury.
What I originally planned to do was make a temporal or 12-hour sun dail making it a decorative object only. This is a sun dial for modern equal hours, the example is for 52 degrees latitude, northern hemisphere. The OpenScad file is included and be set for different north-south positions.
I tried to base the dimensions on proper calculations, but couldn't get it right. It looks like the original, so I did something right :-). A smarter person than me may find the proper solution.

Usage:
The object requires a thin pole stuck through the proper month hole (roman numerals) until it reaches the opposite hole. Then orient the pole to the direction of the sun, so a vertical shadow appears. The end of the pole shadow should indicate the natural hour.

If the weather improves, I'll add real live images :-).

Source:
The original inspiring article appeared in "BulkBoek JAARGANG 13/NR 143 from 1984". It was a special on "School Subjects in Midieval Perspective". The drawing is from J.A.F. de Rijk. https://www.bulkboek.nl/

https://en.wikipedia.org/wiki/Sun_dial#Vertical_sundials

https://en.wikipedia.org/wiki/Solar_zenith_angle

https://en.wikipedia.org/wiki/Position_of_the_Sun#Declination_of_the_Sun_as_seen_from_Earth

Print instructions

The four parts for the sides of a short pillar, and should be kept in place with the top and bottom (red).

The pole of 112 mm should be about 1.5 mm.

A "M600" filament change was inserted before the second last layer.

The panels tend to warp after printing, so I used some glue in the middle.

The original was intended with the MMU2 and printed upside down, but the results were less.

Resolution: 0.15 mm layer, 0.4 mm nozzle

Filament: PLA