These two fuel funnels are for putting additives or fuel into cars that have the anti miss fuel or anti syphon feature where there's a metal flap that needs to be opened to gain access to the tank. I printed them both on a Bambu Lab A1 mini and a P1P at the standard 15% infill and they work fine, if you want to print them stronger you can use the print profiles i have added. They are all 25% for a little more strength. Please note that PLA is not technically fuel safe but I find that as long as you wash them well with hot soapy water immediately after use they're fine.