<p>The width you did of&nbsp;4.3mm before casting and cleaning seems fine to me but maybe a bit too much if customer wants exactly 3.9mm.&nbsp;</p>

<p>You could reduce to&nbsp;4.1 mm in order to achieve 3.9 after casting and cleaning. It&#39;ll be very thin, but if this is what the customer wants let&#39;s do it.</p>

<p>So Andrey please confirm with customer the size he wants <u>on finished product and on 3D file.</u> &nbsp;<strong>Then we will do what he wants.</strong></p>