<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1508288600184_7292">A 3D printer is not really the right approach to simulate glass block for a couple of reasons. First, it will NOT be truly clear. Time to print something with much thickness is also quite substantial.</div><div id="yui_3_16_0_ym19_1_1508288600184_7494"><br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1508288600184_7421">I would suggest vacuum forming as the best choice. In fact you can purchase it already made from Rose Brand and <a href="http://www.tulnoylumber.com/" id="yui_3_16_0_ym19_1_1508288600184_7452" class="">http://www.tulnoylumber.com/</a><br></div><div id="yui_3_16_0_ym19_1_1508288600184_7460"><br></div><div id="yui_3_16_0_ym19_1_1508288600184_7615" dir="ltr">If you don't have a vacuum former, you may also use the services of a sign maker, who has one. I had a plastics supplier who would do a 4' Square "pull" for quite cheap, if I purchased the plastic from him. Of course, you provide the mold, which can be carved from urethane foam. If you use that approach, the 1st layer of plastic would be a thin one, which is left in place.<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1508288600184_7654"><br></div><div id="yui_3_16_0_ym19_1_1508288600184_7508">-Joe<br></div></div></body></html>