I just got a Dremel 3D45 3D printer. I really got it to make enclosures for some of the odor-sensing chips I'm working with but as a first project I made Waterhouse stops for my Darlot lens as well as an adapter to let me front mount my Luc shutter on it. I'm pretty sure I can print lensboards with it. the output seems more than strong enough to handle a reasonable sized lens for 5 x 7 or 4 x 5. For some reason I don't seem to be able to upload a photo so here's a link to a picture on Dropbox
https://www.dropbox.com/s/qnb9lhk9tw...Small.jpg?dl=0
Edit: By the way, when the file is preprocessed for the printer, solid areas are filled with a honeycomb (or other) pattern so there is just a solid rim around holes. It uses a lot less material and saves a lot of time in addition to making a very lightweight but strong part.. If I were making a lensboard I'd make it with the hole in place for whatever lens I was planning to mount. In order to have sufficient material around the hole to screw on a flange it's possible to specify a "wall thickness" thick enough to take the fastener. Tests have been done with bolts threaded directly into a 3D printed panel and extraction force required was well over 100Kg so it shouldn't present a problem for most lenses.
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