Fix groove not cutting properly by adjusting CAM groove length tolerance

Set the groove length tolerance in the admin CAM settings to half the bit diameter so grooves come out correctly in production files.

1. When a groove is not coming out properly in production files, set the groove length tolerance in the admin portal under Settings > Manufacturing Settings > CAM Settings to half the diameter of the bit being used to cut the groove (e.g. 4 mm for an 8 mm bit).