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11 Appendix 6. Pneuma Triaxial Pro Tool Manual
11.1 Print Head Overview
The dispensing with the Pneuma Triaxial Pro Tool print head (Figure 10) is based on the pneumatic
extrusion. The triaxial needle enables the printing of up to three different materials simultaneously,
i.e., the core material, intermediate material and the outer shell material.
The print head has a heating function enabling a constant temperature from RT to +66 °C in the
biggest syringe barrel (10 mL). In addition, the print head is equipped with an integrated UV/Vis LED
module emitting at a wavelength of 365 nm, 405 nm or 450 nm. It allows in situ photocrosslinking
of the photosensitive non-viscous bioinks during the deposition process. Pneuma Triaxial Pro Tool is
compatible with various commercial and noncommercial low-to-medium viscosity hydrogel bioinks
and pastes; however, if the printed material breaks the tool, it is not covered by the warranty.
The standard sizes of the triaxial needle channels are as follows: the innermost needle 26 G
(I.D.=0.254 mm), the middle needle 19 G (I.D.=0.690 mm) and the outer needle 15 G (I.D.=1.37
mm). In the standard design, all the needle tips have the same length. Custom needles with other
inner diameters and tip lengths can be delivered according to a request.
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