After printed the original Thing by freemark, I tried to make a small mod to have the circle in horizontal.

V1 is nicer but requires support structures. V2 is more 'classic' and simplier to print.

Check out all my Anet A8 projects:

• Anet A8 Prusa i3 Simple filament guide (Horizontal) http://www.thingiverse.com/thing:1764285
• Anet A8 RPi Camera Bed mount http://www.thingiverse.com/thing:1867549
• Anet A8 Y Axis Cable Chain v2 http://www.thingiverse.com/thing:1915486
• Anet A8 hotbed thermal insulation http://www.thingiverse.com/thing:1917197
• Anet A8 Power supply cover w\LCD power meter http://www.thingiverse.com/thing:2087761
• Anet A8 Z-Axis RPi Camera mount for panning timelapses http://www.thingiverse.com/thing:2265949
• Anet A8 LED Illumination MOD http://www.thingiverse.com/thing:2285674
• The One - Anet A8 - Universal Spool Holder https://www.thingiverse.com/thing:2456038
• Anet A8 Easy Magnetic Extruder Access Mod (8x2 magnets) https://www.thingiverse.com/thing:3512382