50mm lens holder for cheap eBay 20D lenses
thingiverse
Since I am an Internist rather than an ophthalmologist, I can't justify a $500 Volk 20D lens. Instead, I purchased a $50 lens from eBay in India (check out the link below) which works great but is smaller by several mm in diameter than the one this older model was designed for. So, I created my own using OnShape CAD and here are the STL and STEP files for anyone who wants to use these more affordable lenses. https://www.ebay.com/itm/20D-Double-Aspheric-20D-Ophthalmic-Diagnostic-Lens-Top-Quality-FREE-SHIPPING/192337418918?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
With this file you will be able to print 50mm lens holder for cheap eBay 20D lenses with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on 50mm lens holder for cheap eBay 20D lenses.