This is a rough 3D model of the CH-926 footprint. The measurements are probably not exact but pretty close for simple designs and brackets^^.
Coin Programming Instructions for CH-926
^^ DISCLAIMER : I haven't done a full print or checked the measurements so I will leave it here for you to use as you wish, all I ask is that if you find it useful comment here and upload what you make and link it here so that more printable parts become available for this 6 coin, coin-acceptor.
If you need bulk pricing on these coin acceptors which are very reliable and tested under extreme conditions 24 hours a day, 7 days a week, please let me know in comments. I have access to unlimited quantities at reasonable pricing.