The non-wetted parts of the cooling housing and lamp holder were printed in the harder material -PLA. One of the critical considerations for additive manufacturing processes such as 3D printing, is the engineering of the printer itself and the limitations of that design and material. Common to many of the lower cost 3D printers, our Ultimaker™ printer builds 3-dimensional pieces layer by layer onto a bed which is height controlled. The distance from the bed to the print head is increased to build layer upon layer. The consequence of which is that any design has to be built from the bottom upwards. In contrast, this consideration is reversed for SLA printers that print from the top downwards. It is therefore a key consideration in the design of the components, that the base is deliberately designed to be wider than the top.