Melting case

[johnwhyte]

Hi, I really love your idea for a printer in each student desk. I think this design is great, but have some small areas which requires to be improved. I bought a printer with this design from HobbyKing website, and after one hour of use the case was melted.

I think the problem was that the acrylic plastic can hold temperatures up to 60 degrees without deforming or melting. But the stepper motors can reach more than 80 degrees (at least the specifications for the Nema 11 stepper says they can rise the temperature by 80 degrees).

In yout design the stepper motors for x and y axis are attached to the case using 3 screws. I think this needs to be changed and attach them by 4 screws. Ideally using some sort of metallic frame for the steppers, or not sure if some washers will suffice. Trying to distribute the heat in a big surface to avoid the deformation of the case.

[noaizumi]

Hi, thanks for your concern. I m the designer of TinyBoy, basically we know the stepper can running up in high temperature and thats why we always choose good quality acrylic sheets (import from taiwan) for building TinyBoy. We have build over 200+ machines, some of them running over 1000 hours and nil of them melted the case.

For the HobbyKing machine, we don't know what stepper and what plastic sheets they choose. Perhaps you can send this issue to they customer service and see they can give you a helping hand.