This piece is intended for extending GuerillaBeam projectors.-decreases minimum focus distance (lens side)-increases backround illumination evenness (light side)Notable features realized with OpenJSCAD:-additive screw thread with custom profile-chamfered threads-engraved labelingThe OpenJSCAD code is still a bit of a mess, but works pretty well.Features inherited from GuerillaBeam:-screw threads optimized for 3d printing (45 degree overhangs, large tolerance, self-centering, enlarged male base for great stability)