Hydro Flask Car Cupholder Adapter

grabcad

Nearly all Hydro Flasks fit securely with this thing. This adapter precisely fits the 32 and 40 ounce stainless steel Hydro Flask bottles in its major ID. All other sizes* of Hydro Flask fit in the next smaller step down, also a precise, secure fit. * except the 64 ounce wide, True Pint and the two food sizes This photo from the company's FAQ shows the : https://d3oco3p7h2m8kx.cloudfront.net/skin/frontend/hydroflask/default/images/HF-Product-Size-Chart-for-Web.png The bottom remains open such that most paper cups (and the Hydro Flask True Pint) will fit while this adapter remains in your car's standard cup holder. Solidworks (2015), STL and Parasolids models are all included. UPDATED: (11/25/2015, 2:50pm PST): made 32/40 ounce holder 0.5mm smaller, 12-24 ounce holder 0.5mm bigger and added vented version (REV d) (11/30/2015) added screen shot of cross section (before fillets and chamfers) (12/1/2015) replaced all files with REVe and REVf that print with perfect-fit diameters for my 18 ounce and 40 ounce wide mouth flasks (Afinia printer 0.3mm layer height, <30 degree support)