Home › Forums › Printing Discussions › General Printing Topics › Optical clear vinyl. OPOS marks not read by Summa. Any solutions to this? General Printing Topics Optical clear vinyl. OPOS marks not read by Summa. Any solutions to this? Posted by Pane Talev on 3 March 2021 at 10:01 Good day all. I have a print and cut job. Optical clear vinyl. OPOS marks not read by Summa. Any solutions to this? I already tried gluing small white squares on the back – did not work. Any ideas? Pane Talev replied 4 years, 7 months ago 2 Members · 4 Replies 4 Replies Kevin Mahoney Member 3 March 2021 at 10:11 Hi Pane, try running a strip of white vinyl up the carriage bed of the plotter Pane Talev Member 4 March 2021 at 15:20 Hi Kevin. My first white squares were to small. Bigger piece of white vinyl worked. Cheers Kevin Mahoney Member 4 March 2021 at 16:50 What printer did that Pane? Pane Talev Member 4 March 2021 at 18:06 Mutoh ValueJet 1624x Log In to Reply Log in to reply. Public All Members My Connections Only Me PublicAll MembersMy ConnectionsOnly Me Public All Members My Connections Only Me Log In to Reply Start of Discussion 0 of 0 replies June 2018 Now