Aquarium Suction scraper
thingiverse
I designed this scraper because I needed to scrape polyps off my glass without having anything get into the tank. The prototype in the pics uses a plastic razor blades like the ones in this kit: https://www.amazon.com/FOSHIO-Scrapers-Contoured-Refillable-Application/dp/B076BBW1WM?crid=1W2VYVISY3VUO&keywords=plastic%2Brazor%2Bblades&qid=1673824961&sprefix=plastic%2Brazor,aps,156&sr=8-1-spons&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzQTNYWlJHWU8xSzdSJmVuY3J5cHRlZElkPUEwNjY2NzY4MjY4WE8zVDhCQ0QwMyZlbmNyeXB0ZWRBZElkPUEwNjg0OTAwM0s1V0c4SUQ1WFhOMiZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU&th=1&linkCode=sl1&tag=&linkId=c12b695c915418df8594c5ef1f6b91a8&language=en_US&ref_=as_li_ss_tl I used 3/8 ID tubing, which is about 12mm OD. The tool works perfectly for my application. Let me know if it works in the comments. Buy me a coffee if you like it. Thanks!
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