Quad Lock wall mount plate for shower or workshop
A flat plate with a Quad Lock style twist-lock recess so any phone in a Quad Lock case snaps onto a shower wall, a workshop board or the side of a fridge. The recess copies the four-lug pattern of the case back, about 37 mm across and 4 mm deep, and the lugs turn 45 degrees into stops; a small printed bump gives a firm friction hold in place of the spring lever. The 70 x 70 mm plate is 6 mm thick with four 4.5 mm screw holes, a drainage slot at the bottom, and prints face down with no supports.
The lug recess is tight geometry and a file drawn for another printer will either bind or spin. In SpeakCAD you give the lug measurements from your own case, preview the plate free in the browser, adjust the twist stop or screw pattern in the chat, then download the STL.
Create a 70 x 70 x 6 mm wall plate with a Quad Lock style recess 37 mm across and 4 mm deep, four lug notches 8 mm wide that rotate 45 degrees into stops, a 0.6 mm friction bump, four 4.5 mm countersunk screw holes at 55 mm centres and a 3 mm drainage slot.