
Bahtinov Focusing Mask
thingiverse
I can't take credit for this but found it among the astronomy boards where I am a member. Created by Philippe LECA - 2015-07-24 (http://www.astrokraken.fr). Fully customizable focusing mask which is used to achieve perfect focus. I used the scaling feature of Cura to make 80mm & 66mm masks for my telescope using this template.
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