8mm Forum: Van eck guide

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Posted by Burton Sundquist (Member # 5813) on July 02, 2019, 01:15 AM:

I would be interested in feedback from other forum members regarding the replacement inlay guide with roller.
I find the roller to be of a coarse finish and if halted will scratch emulsion side of the print. It has happened to me so at this point I think we need a show of hands and a solution.

Posted by Bill Brandenstein (Member # 892) on July 19, 2019, 03:50 PM:

So I learned recently that 3D printing doesn't make perfectly smooth surfaces due to the additive nature of the layering process. Burton, is that what you're seeing here? If some fine sanding were to be done, would it help?

Posted by Paul Adsett (Member # 25) on July 19, 2019, 04:59 PM:

Bill is correct. As far as I know there is presently no way that a 3D printed part can produce the smooth polished micro-inch finish of an injection molded plastic part. Those green Elmo plastic guides have a superb finish.
3d printed parts also do not have the strength capability of molded or machined parts parts, although strength and wear properties can be enhanced by the use of appropriate filler materials.
In the case of the film guides, hopefully film contact will only be made on the leader of the film during threading, so surface finish should be a non-issue for these parts.
As far as the use of 3D parts for projectors my only experience has been the purchase of the Eumig 900 series wormwheel from Van Eck, which so far is working very well for me, even though the surface finish was nowhere near that of the existing molded plastic wormwheel.

Posted by Daniel Macarone (Member # 5102) on July 20, 2019, 11:11 AM:

Well, there's a whole new can of worms for the hobby - a separate company to do a surface finish.

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