EDIT: May 2019. Printed with clear PLA that has different color permanent marker pens scribbled on the reel before printing. The results are a bit random and quite pretty.
The "Gecko 1.5 Magnet" file has a slightly modified hole to make putting the magnet in a bit easier.

First off, this is NOT my design!
The original is from...
http://www.thingiverse.com/thing:1363148
I wish I has this sort of talent.
All I did was to add a 6x1.5mm magnet hole to it so our little gecko can stick to the fridge as a real gecko would.
Shown is the gecko printed at .3mm res and .1mm so you can see the difference.
This thing modification was made with Tinkercad. Edit it online https://www.tinkercad.com/things/j7qCpJpKzCg

So far I have printed well over 3000 of these and given them away just for fun.
Now I generally use white PLA and scribble on the reel with permanent markers before printing so each gecko is different.
And often I place them in odd locations too.

Deltaprintr

Deltaprintr Kit

No

No

.1 for good results, but .3 is ok too.

25%

This is a great little model, hats off to WebmasterZero :)
It prints well with no support or raft needed and is a very popular one with the grandchildren (and grownups too).
This is WebmasterZero's design with a hole for a 6x1.5mm magnet superglued into it.