This is the spool holder you should print for your TinyBoy 3D printer. You can print this with your tiny boy printer.

It holds your PLA Filament spool on the back of the printer. It take very few room. You can put a spool up to 53/54mm wide, but as the TinyBoy printer is a small and light frame, you shouldn't put spool heavier than 0,5 or 0,75Kg.

You should print this Filament guide with it : http://www.thingiverse.com/thing:969626

I could not be in any case responsible of any damage or anything wrong on your printer.

You should print it on the slice as shown on pictures.
with support enabled.

Any layer thickness is good. Mine is printed at 0,4mm per layer.