3D Printed Gaming D-Pad
thingiverse
For custom single-handed controllers, I use tact switches that allow you to relocate the D-pad anywhere, such as in the middle of an Xbox 360 controller between the D-pad and right analog stick. The top and bottom shells snap together after aligning the D-pad with buttons; secure with superglue for a firm hold. Here's the link to the tact switches: http://www.newark.com/jsp/search/productdetail.jsp?SKU=67P3614
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