This is a holder that perfectly fits my OnePlus One WITH CASE COVER! The only holders available online are fitted for OPO without a case which is kinda stupid. And I didn't want to use any of the universal holders, as they are too fiddly... So I drew my own holder that fits the feet of my car mount. They are arranged in a 23mm x 36mm rectangular, so if your car mount has different feet, it won't work. I printed it with 1mm wall, 20% infill and 0.6 Bottom/Top thickness...OPO_Holder2 is a Holder wide enough to fit an OPO's with a protection case. OPO Holder No Case fits an OPO without any case. I printed it both in ABS and PLA with 50% infill.