Originally designed the magnetic coaster because I have a metal cabinet next to my desk and I hate having my drinks on my desktop (or the top of that cabinet) Now I can just place them in the coaster that sticks to the side of the cabinet. I used these magnets from amazon and super glued them in place. The holes should fit up to 20mm magnets just a bit more snugly. You'll need to fill all 6 slots in order for this to hold a normal glass or coffee mug. I have a version for beer cans/bottles here.
For the Skadis (peg board) coaster you'll need to go print the Skadis Universal Peg by @GabC as I designed this to work with that so it could still be printed without supports.
The Coaster with screw holes is self explanatory.
No supports needed. I printed these with 40% infill so they'd have stability and strength but not be too heavy. These took me 4-5 hours to print. Comments and ideas for improvement welcome! Enjoy!
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