RDR OTW HD69: FFFTech/FFFTechnology

A set of basic risers for the (rather cheapo) OTW HD69 red dot optic. The +15mm to +25mm risers have a hollow section through their bodies to allow for use of iron sights. 

Six risers are available: (READ NOTES)

 * Standard Mount
 * +5mm
 * +10mm
 * +15mm
 * +20mm
 * +25mm

Printer Used: Ender 3 V2

Filament Used: PLA+

Print Settings:

Extruder: 220C 
Bed: 56C 
First Layer Print Height: .20mm 
Standard Layer Height: .12mm
Wall Thickness: .40mm
Wall Perimeters: 6+
Infill: 25%
Infill Pattern: Gyroid
Material Flow: 100%
Support Material Percentage: 18%

Print the mount/riser upside-down

Hardware Needed: 

1x M5x30 Hex Socketed Machine Screw/Bolt

1x M5 Hex Nut (Be sure both bolt & nut are the same thread pitch.)

Notes: 

1) The height of the Standard mount is (from the top of the picatinny rail to the bottom of the red dot's mounting surface) is 4.28mm. That means if you attach the +20mm riser, it's actual height is 24.28mm. The millimeter designations for the risers is based on the addition to the Standard mount's height, not the riser's height itself.