FDM-Printable Microscope Objective RMS Thread

thingiverse

Microscope objective lenses exhibit a 0.8 x 1/36 inch RMS thread: https://en.wikipedia.org/wiki/Screw_thread https://threadingtoolsguide.com/en/blog/thread-in-microscopy-the-microscope-object-thread/ At first it seemed difficult to print a microscope RMS nut thread on FDM 3D-printers: - FDM 3D-printers print horizontal layers of typically 0.3 mm height (or less). But threads are inclined, not horizontal. - This is usually not a problem with coarse threads e.g. M12 x 1.25, see my https://www.thingiverse.com/thing:5404145 But with threads of 0.7 mm lead? Mission impossible? Solution: - On each horizontal FDM layer print only the intersection between the FDM layer and the thread (within a certain vertical allwance). I did not conduct a patent search. If there is a patent then you have to honor it. If there is none then my idea is in the public domain. As always I include the OpenSCAD source file for you to adapt and improve. The enclosed Microscope_RMS_thread_ring.stl file is meant as examples for your testing and is assuming a layer height of 0.3 mm. You may adapt the layer height and other parameters (e.g. vertical allowance) in the OpenSCAD source file. The enclosed Microscope_RMS_thread.stl file (also assuming 0.3 mm layer height) may be integrated into your CAD design if you are using a CAD tool other than OpenSCAD. See also my other designs: https://www.thingiverse.com/thinger13/designs