Hi Jonathan, what a beautifully simple and cheap idea, I have no doubt that will work. I to have problems with my meade lx 200 14 inch finderscope dewing up even with the heater strap working overtime. Although its not a major problem ,its a niggle that really gets on my nerves. Great idea......guess what ill be doing today!!!! lol

Grant

A simple solution to a perennial problem! Another mod in the pipeline methinks!

Dave.

Have to come clean, the sticky on the velcro wasn't great and it eventually came unstuck.  Thin foam isn't very friendly with strong glue so it may require something a bit more physical such as a paper fastener (one of those that splits open like a split pin) or just some good old reliable PVC tape wrapped around each end a few times, maybe a band in the middle too.

I find an elastic band is enough to hold the foam dew shield on the finder scope.  

Perhaps, 7+ years is a good enough time of service for a simple DIY design  ?

I'm personally usually have such stuff 3D printed as soon as needed just overnight since exactly the 2013th  

Nowadays, with the prices on good printers well below $200, there is no excuse for an amateur astronomer with the DIY passion to ignore that severely money-, time-, and effort-saving tech  

I found that the small size of cotton bud container was perfect with the bottom removed.