{"product_id":"suction-balcony-door-knob","title":"suction balcony door knob","description":"\u003cp\u003eOnshape Project URL: \u003ca target=\"_blank\" href=\"https:\/\/cad.onshape.com\/documents\/a72caaa9468cfb1c1f8fcdd4\/w\/e099a04e25b7ec96936a03ef\/e\/cb81bed87c14383b0c171f0d?renderMode=0\u0026amp;uiState=675c6def03e03152a01c9942\" rel=\"nofollow noopener\"\u003ehttps:\/\/cad.onshape.com\/documents\/a72caaa9468cfb1c1f8fcdd4\/w\/e099a04e25b7ec96936a03ef\/e\/cb81bed87c14383b0c171f0d?renderMode=0\u0026amp;uiState=675c6def03e03152a01c9942\u003c\/a\u003e\u003c\/p\u003e\u003ch4\u003e\u003cstrong\u003ehow to print\u003c\/strong\u003e\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eYOU NEED TO PRINT THIS ON A SMOOTH PRINT SURFACE\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eI chose to overextrude a lot to ensure smooth bottom surface with no holes. \u003c\/li\u003e\n\u003cli\u003eI used 5 perimeters for strength and that may have been too much because it's quite hard to squeeze (might be good? I'm not a suction cup scientist). \u003c\/li\u003e\n\u003cli\u003eI used \u003cstrong\u003e90A\u003c\/strong\u003e filament but I assume that all flexibles up to \u003cstrong\u003e95A \u003c\/strong\u003eshould work\u003c\/li\u003e\n\u003cli\u003eno supports\u003c\/li\u003e\n\u003cli\u003eshould print quite easily if your printer is tuned for tpu\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003e\u003cstrong\u003ehow to use\u003c\/strong\u003e\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003esquish the knob before attaching to a smooth surface\u003c\/li\u003e\n\u003cli\u003epush the flat side against a smooth surface\u003c\/li\u003e\n\u003cli\u003elet go of the knob\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ethe knob should magically stick itself to the surface using the power of physics!\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eto unstick the knob just squish it again and it should let go without a fight\u003cul\u003e\u003cli\u003eit might become harder to squish with lower outside temps\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003e\u003cstrong\u003estory\u003c\/strong\u003e\u003c\/h4\u003e\u003cp\u003eI wanted to be able to close balcony door when I'm going out for several reasons, mainly to stop my cats escaping and dying (it's 12th floor) or to stop cold or cigarette smoke from going inside.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eI found \u003ca target=\"_blank\" href=\"https:\/\/www.printables.com\/model\/73849-suction-cup-20-100-printed\" rel=\"nofollow noopener\"\u003eSuction Cup 2.0\u003c\/a\u003e model and while it worked great for a while, it quickly lost it's suction power from when it was first printed and needed to be constantly reset. My girlfriend also broke one because ‘she didn’t see it' through a see-through door. Since I have a few brain cells left I thought how could I create more vaccuum for better suction to a smooth surface. \u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eThen it occured to me that if I squish a TPU knob it will suck air in while unsquishing, so I opened Onshape to quickly draft that idea. I'm happy to say that the knobs are still strongly hanging on my balcony door, although they do get harder to squish with lower temps.\u003c\/p\u003e\u003cp\u003eDesign by japonicki on MakerWorld (license: CC0).\u003c\/p\u003e","brand":"Mymadmanlab","offers":[{"title":"Default Title","offer_id":67434053861680,"sku":null,"price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0987\/0809\/5280\/files\/0_5979239d-8727-45ce-a7b7-0ee50c050b18.png?v=1785724456","url":"https:\/\/mymadmanlab.com\/products\/suction-balcony-door-knob","provider":"Mymadmanlab.com","version":"1.0","type":"link"}