A few key details:

• This print does not require supports or high precision from your printer.
• This print was made for use with 50mm elastic straps.
• The holder fits both the Left and Right Joy-Con.
• On the lower part of the holder I would recommend adding a piece of adhesive foam or electrical tape. (The holder already has a very tight hold on the controller, but adding foam or electrical tape will make it nearly impossible for the controller to slide out in the case that the strap loosens while attached to your body.)