my mystake.. i don't see this blogpost... so for cgtrader 'printable' mean ' can be print on shapeway service'... it is very restrictive...
Some of these rules are at best inadequate and at worst will cause problems if you try to apply them to a model that is optimized to be printed on a FFD printer
let take one : hollow.. hollow is good for shapeways/ sls system.. it reduce the cost of the material (resin and poweder are costly)..
for a FFD printer, it's bad as you can choose the 'infill' of the object (to reduce cost).. abs/pla are very cheap and the cost is minimum..
and it's bad because a good choice of the infill rate help a lot for overhang part (a problem that does not exist on shapeways printer) .. and to let cool the print (another problem that does not exist on shapeways printer) ...
another rule : the 1mm wall... it is a weakness of the shapeways printer /sls... this rule is a non-sense on a FFD printer..you can easily print a model with wall of 0.42mm thickness and the general good rule is a 2 perimeters wall aka : 0.84 mm for a nozzle of 0.35mm
size is again a non-sense : on shapeway, the size matter because you pay for a volume... on a ffd printed, the volume cost only time, and little money..
...
i hope to win the portfolio competition but as a great part of my models are optimized to be printed on FFD printer (' standard consumer product' i.e something that you can buy without the need to sell a arm ... ) ....we will see..