Linhof style lensboards in sizes Copal 0, 1 and 3. I print mine in CF-PETG for better stiffness and lightproof. Other CF materials will work as well. They weigh less than half of standard aluminium lens boards.
0.6 hardened steel nozzle and 0.25mm layer height. My printer MK3S will ooze this filament (FormFutura CF-PETG) like crazy on 1.0 extrusion multiplier. I turned it down to 0.89 for now. Maybe less is needed.
The author marked this model as their own original creation.