Dick Sucker
thingiverse
I created a more detailed version of these designs, thinking I could improve upon what I'd seen before. This model is based on a design from cults3d and was modified in Tinkercad to include a 20mm suction cup that fits snugly into the hole. There's also a second design with a hole for an 8mm magnet. You can find 20mm suction cups online at Amazon: https://www.amazon.com/gp/product/B07BHD441K/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 For the 8mm x 3mm magnets, you can check out this product on Amazon: https://www.amazon.com/gp/product/B07B3SDRCP/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1
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