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| DaJMasta:
May screw with your logo, but you could use some ring shaped traces covered in solder mask with holes in the solder mask between them as little grooves that could catch the edge of glasses that aren't just flat-bottomed - the little bit of thickness could probably make a noticeable difference. Maybe some sort of crosshatching of the traces or solder mask or both on the bottom could increase traction a smidge. Not going to be as stable as a paper one, but a little less slippery than just a bare PCB. |
| Mechatrommer:
try a cold/iced drink and see what happen when it sweats and you want to drink and lift the glass... i have sort of coaster here 3d printed pla pastics that keeps the ants out, surely it can contains spills/sweat just fine but i have to put tissue as sweat absorbent and "non-stickiness" on top. as sweet as it sounds, logos and leds and all but... it can be a wall decoration as well... ymmv. |
| mdszy:
--- Quote from: Mechatrommer on June 30, 2019, 07:40:16 pm ---try a cold/iced drink and see what happen when it sweats and you want to drink and lift the glass... i have sort of coaster here that keeps the ants out, surely it can contains spills/sweat just fine but i have to put tissue as sweat absorbent and "non-stickiness" on top to avoid the issue. as sweet as it sounds, logos and leds and all but... it can be a wall decoration as well... ymmv. --- End quote --- I've been using PCBs as coasters for a while now and they always seem to work just fine in that regard. |
| Mechatrommer:
maybe your pcb is too big, heavy or just the way you lift the glass. i tend to lift a glass straight up and... |
| rcbuck:
I bought a set of these about 10 years ago. https://www.amazon.com/TerraCycle-Circuit-Board-Coasters-set/dp/B0045EJT5E Not sure if you can still buy them. They have a silicone rubber gasket around the outside edge that keeps them from sliding. Each side has a thin plastic coating laminated onto the board so the liquid does not go through the holes. If the iced drink sweats, the glass does stick to the coaster. When you lift the glass the coaster stays stuck to the glass. My solution for that is to let one edge of the glass sit on the silicone ring. Then it doesn't stick to the coaster. If you spill something onto the coaster you have to remove the outer silicone ring, rinse it with water, and rinse the coaster with water. After the rubber ring has dried, just put it back on the coaster. I have had two of them sitting on the sofa end coffee tables for the last 10 years and use them daily. |
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