Here is my remixed version of the astrolabicon puzzle. I've also designed a stand for it here https://www.thingiverse.com/thing:3268756
I really liked this model, and printed a few but none of them out there just nailed it for me. The source version was too small for standard 14mm marbles, and the original I found on another site had too small mags for me and the orientation was not want I wanted.
As a result, my design incorporates the following:
1) It is designed to utilze 12 (6 per hemisphere) 3mm x 8mm mags and they will sit flush to the surface when installed (others I tried extruded up beyond the opening). The larger magnets give a better snappy feeling and ensure proper puzzle alignment. Here is an example of the size & type of magnets required: https://www.amazon.com/gp/product/B01MTCF3SB/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
2) I positioned my magnets to be aliged center to the marble channels and not the arms for optimal channel alingment during puzzle use.
3) My design is perfect size to support 14mm glass marbles. It requres 6 marbles in 4 variying colors (or other patterns if you prefer). If you purchase the same set as I used, you will have enough to make two puzzles - sort of. One puzzle can have 4 colors of 6 marbles each, and the other can have 2 colors of 6 marbles and 4 other colors of 3 marbles (I used alternating patters on the two ends). Here is what I purchased and what is used in my puzzle: https://www.amazon.com/gp/product/B016SS7TWY/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
4) I printed at 10% infill which you may think makes for a light model, which it does. However, with the marbles installed, the print is quite stout and has a nice feel. If you do want heavier, there is no issue printing with higher infill. I will say that the puzzle is loud with all the marbles clanking and the mags snapping, but I enjoy the tactile element of it quite a lot. Just can't play with it in bed while my wife is trying to sleep.
FYI, I've had perfect success with this model printing both with PLA and PET. Do not use supports. There will only be modest cleanup required (I just scraped with razor knife) on the underside of each of the side channels at their apex.
Print two hemispheres and center pin, and assemble as follows:
1) Use superglue or similar quick dry adhesive to affix magnets into recesses.
2) When installing magnets, I found it best to work with each hemishpere seperately and spaced apart so that the magnets do not attract. Begin with installing two magnets opposite of each other on one of the hemishperes.
3) Wait at least 10 minutes for glue to dry, then proceed to doing one or two more magnets. You must wait the time because the magnets are so strong that adjacent ones will suck other mags right out of their holes if the glue is not set - be patient.
4) Take extreme measures to ensure that the polarity is the same on all magnets in the first hemisphere. Get one wrong and your puzzle is toast - I had to cut up a couple of them. To help, I test every maget for polarity orientation before I installed it and immedetly after before glue dried by using a loose mag to ensure they repelled. If you inset wrong, just use a loose mag to pull it out of the hole before the glue dries.
5) Do the same process for the other hemisphere, but of course be 100% positive that the orientation is not only the same for all 6 mags, but also that they will attract to the other hemisphere when joined together.
6) Insert the pin in the center hole but do not glue as it is a perfect fit. If you feel you must, ONLY GLUE TO ONE HEMISPHERE - duh!
7) Insert marbles into each groove of each hemisphere, and join together . . . Voila, you have puzzle!